Meta: Port recent changes to the GN build

29396415d58b0775d2ca1360362966c75dc4d255
1aed465efe407143e32ecb464bc136ac9f0e8bda

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

@@ -17,6 +17,8 @@ shared_library("LibPDF") {
     "Fonts/Type0Font.cpp",
     "Fonts/Type1Font.cpp",
     "Fonts/Type1FontProgram.cpp",
+    "Fonts/Type3Font.cpp",
+    "Function.cpp",
     "Interpolation.cpp",
     "ObjectDerivatives.cpp",
     "Page.cpp",