Eolian: Fixed pc file to correctly generate.

First of all, it's now correctly generated, unlike before.
Second of all, it now lists eoincludedir, the directory for all
of the .eo include files.

pc/eolian.pc.in

@@ -1,11 +1,12 @@
-prefix=@CMAKE_INSTALL_PREFIX@
-exec_prefix=${prefix}
-libdir=${exec_prefix}/lib
-includedir=${prefix}/include
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+eoincludedir=@datarootdir@/eolian/include
 
-Name: Eolian
+Name: eolian
 Description: EFL's .eo parser and code generator.
-Version: @LIB_VERSION@
+Version: @VERSION@
 Libs: -L${libdir} -leolian
-Libs.private:
-Cflags: -I${includedir}/eolian-1
+Libs.private: @requirements_libs_eolian@
+Cflags: -I${includedir}/efl-@VMAJ@ -I${includedir}/eolian-@VMAJ@