CMake: pkgconfig: Preserve execprefix and support absolute lib/include dirs
CMake: pkgconfig: Preserve execprefix and support absolute lib/include dirs

EasyRPG/liblcf,Ghabry/easyrpg-liblcf,carstene1ns/easyrpg-liblcf,EasyRPG/liblcf,Ghabry/easyrpg-liblcf,carstene1ns/easyrpg-liblcf,EasyRPG/liblcf,carstene1ns/easyrpg-liblcf,Ghabry/easyrpg-liblcf,Ghabry/easyrpg-liblcf,EasyRPG/liblcf