Fix detect_assertions on Windows. Turns out the compiler uses forward slashes in paths like on other OSes.
Fix detect_assertions on Windows. Turns out the compiler uses forward slashes in paths like on other OSes.

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