Now that the CMake files for int have been fixed, so that when
LIB_FUZZING_ENGINE is set, it is used as the sole way of specifying
fuzzer-related linker flags, the honggfuzz engine should work. This
change reverts the project to use the default set of fuzzing engines,
which includes honggfuzz.
The LIB_FUZZING_ENGINE environment variable is now passed to tint's
CMake command as an option, rather than having the environment variable
be queried in the project's CMake files.
Currently there are errors building with honggfuzz. This may be because
the tint fuzz targets are not correctly configured - the tint build
system does not use the LIB_FUZZING_ENGINE environment variable and
instead hard codes various fuzzer flags. This will be fixed in due
course, but disabling honggfuzz for now to get the OSS-Fuzz build
working.
Alastair Donaldson