Internal Change PiperOrigin-RevId: 225231727
Internal Change PiperOrigin-RevId: 222123106
Using absolute paths in the pkg-config file makes it not relocatable and leads to problems, when trying to use it with precompiled cross toolchains. Setting prefix to relative path based on pcfiledir makes it more reliable for such cases.
* GTest is a required dependency for GMock, hence we always need to pull it in.
