ANYPS5_BUILD_FUZZERS builds relinker_conversion_fuzzer with AddressSanitizer
and UndefinedBehaviorSanitizer in relinker-only Clang builds on Linux. The
first input byte selects the target system, --to-intel and the unused-filter
level; the rest is the executable passed to Conversion::Convert, the path the
web converter takes. tools/relinker_fuzz_seeds.py writes the relinker test
fixtures as seeds, and CTest runs a short smoke run.
