Meta: Add gn build for LibPDF

Meta/gn/secondary/Userland/Libraries/LibPDF/BUILD.gn

@@ -0,0 +1,37 @@
+shared_library("LibPDF") {
+  output_name = "pdf"
+  include_dirs = [ "//Userland/Libraries" ]
+  sources = [
+    "ColorSpace.cpp",
+    "CommonNames.cpp",
+    "Document.cpp",
+    "DocumentParser.cpp",
+    "Encoding.cpp",
+    "Encryption.cpp",
+    "Filter.cpp",
+    "Fonts/CFF.cpp",
+    "Fonts/PDFFont.cpp",
+    "Fonts/PS1FontProgram.cpp",
+    "Fonts/SimpleFont.cpp",
+    "Fonts/TrueTypeFont.cpp",
+    "Fonts/Type0Font.cpp",
+    "Fonts/Type1Font.cpp",
+    "Fonts/Type1FontProgram.cpp",
+    "Interpolation.cpp",
+    "ObjectDerivatives.cpp",
+    "Page.cpp",
+    "Parser.cpp",
+    "Reader.cpp",
+    "Renderer.cpp",
+    "Value.cpp",
+  ]
+  deps = [
+    "//AK",
+    "//Userland/Libraries/LibCompress",
+    "//Userland/Libraries/LibCore",
+    "//Userland/Libraries/LibCrypto",
+    "//Userland/Libraries/LibGfx",
+    "//Userland/Libraries/LibIPC",
+    "//Userland/Libraries/LibTextCodec",
+  ]
+}