Fix make test-fuzz-corpora warnings
The following bug warnings should probably be protocol warnings, or be caught earlier:
./src/test/fuzz_static_testcases.sh
Running tests for consensus
Feb 16 02:17:26.012 [warn] tor_timegm: Bug: Out-of-range argument to tor_timegm (on Tor 0.3.0.3-alpha-dev d633c4757c1392fb)
Feb 16 02:17:30.133 [warn] sr_parse_commit: Bug: SR: Commit algorithm "sha6-256" is not recognized. (on Tor 0.3.0.3-alpha-dev d633c4757c1392fb)
Feb 16 02:17:34.625 [warn] commit_decode: Bug: SR: Commit from authority 20EE989200EF98A75102B461DF62F01B2932C0D6 decoded length doesn't match the expected length (36 vs 40). (on Tor 0.3.0.3-alpha-dev d633c4757c1392fb)
Feb 16 02:17:40.758 [warn] commit_decode: Bug: SR: Commit from authority B0F141F4B8CCBCC328572C71E5590BBA19775594 can't be decoded. (on Tor 0.3.0.3-alpha-dev d633c4757c1392fb)
Running tests for descriptor
Feb 16 02:18:08.780 [warn] tor_timegm: Bug: Out-of-range argument to tor_timegm (on Tor 0.3.0.3-alpha-dev d633c4757c1392fb)
Running tests for extrainfo
Feb 16 02:18:18.548 [warn] tor_timegm: Bug: Out-of-range argument to tor_timegm (on Tor 0.3.0.3-alpha-dev d633c4757c1392fb)
...
I'm not sure whether we need this in 030, but it would be nice to fix them eventually.