Android log calls undefined

[AntonioDLC]

Chipmunk2D/src/CMakeLists.txt

Line 32 in 1d01b2a

target_link_libraries(chipmunk m)

I don't have any experience for cmake except for today and when I tried to get chipmunk going on Android I came across this and 'undefined' compilation error which was fixed when linking chipmunk against android and log libraries if(ANDROID).

I didn't attempt a PR since this may be due to my inexperience with cmake and not a real error.
If anyone knowledgable enough in this ghost town sees this, please tell me if I'm right or not.