lua5.3/pkgconfig: add lua5.3.pc

Some applications try to build using `pkgconfig lua5.3 --libs...` as some major
distributions use this name. Add a symlink to the lua.pc pkgconfig file.

Signed-off-by: Roosembert Palacios <roosembert.palacios@epfl.ch>

pkgs/development/interpreters/lua-5/5.3.nix

@@ -53,6 +53,7 @@ stdenv.mkDerivation rec {
     Libs: -L$out/lib -llua -lm
     Cflags: -I$out/include
     EOF
+    ln -s "$out/lib/pkgconfig/lua.pc" "$out/lib/pkgconfig/lua${luaversion}.pc"
   '';
 
   meta = {