Revert "Replace hardcoded library name with find_library()"
Revert "Replace hardcoded library name with find_library()"

This reverts commit 1f724c3f00c2eddd0e27989c0f4110c065779354.

Conflicts:
	CMakeLists.txt

This attempts to fix the stupid clock_gettime() error:

https://travis-ci.org/Zeex/sampgdk/builds/17462209

Zeex/sampgdk,WopsS/sampgdk,Zeex/sampgdk,WopsS/sampgdk,WopsS/sampgdk,Zeex/sampgdk