add basic discord support

DPP/win32/lib/pkgconfig/opus.pc

@@ -0,0 +1,16 @@
+prefix=${pcfiledir}/../..
+# Opus codec reference implementation pkg-config file
+
+exec_prefix=${prefix}
+libdir=${prefix}/lib
+includedir=${prefix}/include
+
+Name: Opus
+Description: Opus IETF audio codec ( build)
+URL: https://opus-codec.org/
+Version: 0
+Requires:
+Conflicts:
+Libs: -L"${prefix}/lib" -lopus
+Libs.private: 
+Cflags: -I"${prefix}/include/opus"

DPP/win32/lib/pkgconfig/zlib.pc

@@ -0,0 +1,14 @@
+prefix=${pcfiledir}/../..
+
+exec_prefix=${prefix}
+libdir=${prefix}/lib
+sharedlibdir=${prefix}/lib
+includedir=${prefix}/include
+
+Name: zlib
+Description: zlib compression library
+Version: 1.2.11
+
+Requires:
+Libs: -L"${libdir}" -L"${sharedlibdir}" -lzlib
+Cflags: -I"${includedir}"