Documentation+Toolchain: Don't try to build CMake from source

This build step is a bit excessive. Let's require people to have an
up-to-date CMake from their system package manager instead.

Documentation/BuildInstructionsLadybird.md

@@ -15,7 +15,7 @@ NOTE: In all of the below lists of packages, the Qt6 multimedia package is not n
 ```bash
 sudo apt install autoconf autoconf-archive automake build-essential git cmake libavcodec-dev libgl1-mesa-dev nasm \
                  ninja-build qt6-base-dev qt6-tools-dev-tools qt6-multimedia-dev qt6-wayland ccache fonts-liberation2 \
-                 zip unzip curl tar libssl-dev
+                 zip unzip curl tar
 ```
 
 #### CMake 3.25 or newer:

Meta/CMake/cmake-version.cmake

@@ -1,6 +0,0 @@
-# Note: Update this alongside Toolchain/BuildCMake.sh
-set(version_ok 0)
-if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.25.1)
-    set(version_ok 1)
-endif()
-execute_process(COMMAND "${CMAKE_COMMAND}" -E echo "${version_ok}")

Meta/ladybird.sh

@@ -153,20 +153,11 @@ delete_target() {
     [ ! -d "$BUILD_DIR" ] || rm -rf "$BUILD_DIR"
 }
 
-build_cmake() {
-    echo "CMake version too old: build_cmake"
-    ( cd "$LADYBIRD_SOURCE_DIR/Toolchain" && ./BuildCMake.sh )
-}
-
 build_vcpkg() {
     ( cd "$LADYBIRD_SOURCE_DIR/Toolchain" && ./BuildVcpkg.sh )
 }
 
 ensure_toolchain() {
-    if [ "$(cmake -P "$LADYBIRD_SOURCE_DIR"/Meta/CMake/cmake-version.cmake)" -ne 1 ]; then
-        build_cmake
-    fi
-
     build_vcpkg
 }
 

Toolchain/BuildCMake.sh

@@ -1,74 +0,0 @@
-#!/usr/bin/env bash
-
-# This script builds the CMake build system
-set -e
-
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
-
-# shellcheck source=/dev/null
-. "${DIR}/../Meta/shell_include.sh"
-
-exit_if_running_as_root "Do not run BuildCMake.sh as root, parts of your Toolchain directory will become root-owned"
-
-PREFIX_DIR="$DIR/Local/cmake"
-BUILD_DIR="$DIR/Build/cmake"
-TARBALLS_DIR="$DIR/Tarballs"
-
-NPROC=$(get_number_of_processing_units)
-[ -z "$MAKEJOBS" ] && MAKEJOBS=${NPROC}
-
-check_sha() {
-    if [ $# -ne 2 ]; then
-        error "Usage: check_sha FILE EXPECTED_HASH"
-        return 1
-    fi
-
-    FILE="${1}"
-    EXPECTED_HASH="${2}"
-
-    SYSTEM_NAME="$(uname -s)"
-    if [ "$SYSTEM_NAME" = "Darwin" ]; then
-        SEEN_HASH="$(shasum -a 256 "${FILE}" | cut -d " " -f 1)"
-    else
-        SEEN_HASH="$(sha256sum "${FILE}" | cut -d " " -f 1)"
-    fi
-    test "${EXPECTED_HASH}" = "${SEEN_HASH}"
-}
-
-# Note: Update this alongside the cmake port, and Meta/CMake/cmake-version.cmake if the build requires this version of cmake.
-CMAKE_VERSION=3.26.4
-CMAKE_ARCHIVE_SHA256=313b6880c291bd4fe31c0aa51d6e62659282a521e695f30d5cc0d25abbd5c208
-CMAKE_ARCHIVE=cmake-${CMAKE_VERSION}.tar.gz
-CMAKE_ARCHIVE_URL=https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/${CMAKE_ARCHIVE}
-
-mkdir -p "$DIR"/Tarballs
-pushd "$DIR"/Tarballs
-    if [ ! -e "${CMAKE_ARCHIVE}" ]; then
-        echo "Downloading CMake from ${CMAKE_ARCHIVE_URL}..."
-        curl "${CMAKE_ARCHIVE_URL}" -L -o "${CMAKE_ARCHIVE}"
-    else
-        echo "${CMAKE_ARCHIVE} already exists, not downloading archive"
-    fi
-
-    if ! check_sha "${CMAKE_ARCHIVE}" "${CMAKE_ARCHIVE_SHA256}"; then
-        echo "CMake archive SHA256 sum mismatch, please run script again"
-        rm -f "${CMAKE_ARCHIVE}"
-        exit 1
-    fi
-
-    if [ ! -d "cmake-${CMAKE_VERSION}" ]; then
-        echo "Extracting ${CMAKE_ARCHIVE}..."
-        tar -xf "${CMAKE_ARCHIVE}"
-    else
-        echo "cmake-${CMAKE_VERSION} already exists, not extracting archive"
-    fi
-popd
-
-mkdir -p "${PREFIX_DIR}"
-mkdir -p "${BUILD_DIR}"
-
-pushd "${BUILD_DIR}"
-    "${TARBALLS_DIR}"/cmake-"${CMAKE_VERSION}"/bootstrap --generator="Ninja" --prefix="${PREFIX_DIR}" --parallel="${MAKEJOBS}"
-    ninja -j "${MAKEJOBS}"
-    ninja install
-popd