tests/test-fuzz-targets.t

test-pathconflicts-merge: stop requiring symlink support

The errors from the last time I took a shot at this back in early November have
disappeared, so let's just enable this.

#require clang-libfuzzer test-repo
  $ cd $TESTDIR/../contrib/fuzz
  $ make
Just run the fuzzer for five seconds to verify it works at all.
  $ ./bdiff -max_total_time 5