watchman: drop some py2 compat code
The `unicode` reference was being flagged by pytype, even though it was never
evaluated on py3. There's more that can be dropped and `compat.py` can probably
be inlined if we don't care about minimizing the code changes from FB. But I
don't feel like dealing with that.
fixbundle() {
grep -v 'saving bundle' | grep -v 'saved backup' | \
grep -v added | grep -v adding | \
grep -v "unable to find 'e' for patching" | \
grep -v "e: No such file or directory" | \
cat
}