Revert "Switch Linux to Clang going forward as well."
Revert "Switch Linux to Clang going forward as well."

This reverts commit 3d8187a2b2c89d6545b310d8609ae9e70a6a52f0.

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