Ports: Add libwebp

This library includes webp converter to other formats as well and could
be used as reference implementation for performance improvements.

Ports/AvailablePorts.md

@@ -169,6 +169,7 @@ This list is also available at [ports.serenityos.net](https://ports.serenityos.n
 | [`libuuid`](libuuid/)                               | libuuid (from util-linux)                                       | 2.38                      | https://github.com/karelzak/util-linux/tree/master/libuuid                     |
 | [`libuv`](libuv/)                                   | libuv                                                           | 1.44.1                    | https://github.com/libuv/libuv                                                 |
 | [`libvorbis`](libvorbis/)                           | libvorbis                                                       | 1.3.7                     | https://github.com/xiph/vorbis                                                 |
+| [`libwebp`](libwebp/)                               | libwebp                                                         | 1.3.1                     | https://github.com/webmproject/libwebp                                         |
 | [`libxml2`](libxml2/)                               | libxml2                                                         | 2.9.14                    | http://www.xmlsoft.org/                                                        |
 | [`libyaml`](libyaml/)                               | libyaml                                                         | 0.2.5                     | https://pyyaml.org/wiki/LibYAML                                                |
 | [`libzip`](libzip/)                                 | libzip                                                          | 1.8.0                     | https://libzip.org/                                                            |

Ports/libwebp/package.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env -S bash ../.port_include.sh
+port='libwebp'
+version='1.3.1'
+useconfigure='true'
+files=(
+    "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-${version}.tar.gz b3779627c2dfd31e3d8c4485962c2efe17785ef975e2be5c8c0c9e6cd3c4ef66"
+)
+depends=(
+    'libjpeg'
+    'libpng'
+    'libtiff'
+)
+configopts=(
+    "--with-pnglibdir=${SERENITY_INSTALL_ROOT}/usr/local/include"
+)

Ports/libwebp/patches/0001-libtool-Enable-shared-library-support-for-SerenityOS.patch

@@ -0,0 +1,78 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Liav A <liavalb@gmail.com>
+Date: Fri, 1 Sep 2023 23:44:19 +0300
+Subject: [PATCH] libtool: Enable shared library support for SerenityOS
+
+For some odd reason, libtool handles the configuration for shared
+libraries entirely statically and in its configure script. If no
+shared library support is "present", building shared libraries is
+disabled entirely.
+
+Fix that by just adding the appropriate configuration options for
+`serenity`. This allows us to finally create dynamic libraries
+automatically using libtool, without having to manually link the
+static library into a shared library.
+
+This patch here is a bit more elaborate for other ports, as libintl's
+configure includes the code for detecting dynamic linker characteristics
+twice, and it also queries the C++ compiler for shared library support.
+
+Co-Authored-By: Daniel Bertalan <dani@danielbertalan.dev>
+---
+ configure | 22 ++++++++++++++++++++++
+ 1 file changed, 22 insertions(+)
+
+diff --git a/configure b/configure
+index d4507aa5761e23c732cc219af4c1c119055cb377..884c76f4da0d8d2640b9fa66cd869816ff35c927 100755
+--- a/configure
++++ b/configure
+@@ -5635,6 +5635,10 @@ else $as_nop
+     lt_cv_sys_max_cmd_len=8192
+     ;;
+ 
++  serenity*)
++    lt_cv_deplibs_check_method=pass_all
++    ;;
++
+   osf*)
+     # Dr. Hans Ekkehard Plesser reports seeing a kernel panic running configure
+     # due to this test when exec_disable_arg_limit is 1 on Tru64. It is not
+@@ -9224,6 +9228,10 @@ lt_prog_compiler_static=
+       lt_prog_compiler_pic='-fPIC -shared'
+       ;;
+ 
++    serenity)
++      lt_prog_compiler_can_build_shared=yes
++      ;;
++
+     sysv4*MP*)
+       if test -d /usr/nec; then
+ 	lt_prog_compiler_pic=-Kconform_pic
+@@ -10067,6 +10075,10 @@ _LT_EOF
+       fi
+       ;;
+ 
++    serenity*)
++      ld_shlibs=no
++      ;;
++
+     solaris*)
+       if $LD -v 2>&1 | $GREP 'BFD 2\.8' > /dev/null; then
+ 	ld_shlibs=no
+@@ -11474,6 +11486,16 @@ beos*)
+   dynamic_linker="$host_os ld.so"
+   shlibpath_var=LIBRARY_PATH
+   ;;
++serenity*)
++  version_type=linux
++  need_lib_prefix=no
++  need_version=no
++  library_names_spec='${libname}${release}${shared_ext}${versuffix} ${libname}${release}${shared_ext}${major} ${libname}${shared_ext}'
++  soname_spec='${libname}${release}${shared_ext}${major}'
++  shlibpath_var=LD_LIBRARY_PATH
++  shlibpath_overrides_runpath=no
++  dynamic_linker='SerenityOS LibELF'
++  ;;
+ 
+ bsdi[45]*)
+   version_type=linux # correct to gnu/linux during the next big refactor

Ports/libwebp/patches/ReadMe.md

@@ -0,0 +1,21 @@
+# Patches for libwebp on SerenityOS
+
+## `0001-libtool-Enable-shared-library-support-for-SerenityOS.patch`
+
+libtool: Enable shared library support for SerenityOS
+
+For some odd reason, libtool handles the configuration for shared
+libraries entirely statically and in its configure script. If no
+shared library support is "present", building shared libraries is
+disabled entirely.
+
+Fix that by just adding the appropriate configuration options for
+`serenity`. This allows us to finally create dynamic libraries
+automatically using libtool, without having to manually link the
+static library into a shared library.
+
+This patch here is a bit more elaborate for other ports, as libintl's
+configure includes the code for detecting dynamic linker characteristics
+twice, and it also queries the C++ compiler for shared library support.
+
+