Fix regression with --build-with-asan, we were not passing in the compiler name to CC and CXX.
Fix regression with --build-with-asan, we were not passing in the compiler name to CC and CXX.

MozillaSecurity/funfuzz,nth10sd/funfuzz,MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz