Adds custom pc.in files for medialibrary's dependencies

Create a folder contaning pc.in files to force autoconf to look for medialibrary's dependencies
in spefic folders.
Those files need to be converted to pc by replacing @variables@ with the correct paths beforehand.

Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>

pkgs/libvlc.pc.in

@@ -0,0 +1,8 @@
+libdir=@libdir@
+
+Name: LibVLC control API
+Description: VLC media player external control library
+Version: 3.0.0-git
+Cflags: @includedirs@
+Libs: -L${libdir} -lvlc
+Libs.private: -lvlccore 

pkgs/libvlcpp.pc.in

@@ -0,0 +1,8 @@
+prefix=@prefix@
+libdir=${prefix}
+includedir=${prefix}
+
+Name: libvlcpp
+Description: libvlc C++ bindings
+Version: 0.1.0
+Cflags: -I${includedir}