lua: fix .pc file and rename importlib to just liblua

The pc target in the make file is bogus, use the template from Arch
(or parts of it). And don't include the version in the import lib
to keep things simple.

lua/lua.pc

@@ -0,0 +1,14 @@
+V=%VER%
+R=%REL%
+
+prefix=/usr
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: Lua
+Description: An Extensible Extension Language
+Version: ${R}
+Requires: 
+Libs: -L${libdir} -llua
+Cflags: -I${includedir}