When the PATCH function fails, haikuporter resets to ORIGIN, removing patchset commits

[jmairboeck]

I noticed this when updating texlive_core, which uses both a patchset and a PATCH function. The PATCH function failed (because it needs autoconf 2.72 apparently) and HaikuPorter resetted the internal git repo back to ORIGIN, effectively discarding the patchset commits. The flag.patchset file was not deleted, however, so that results in an inconsistent state.

Do we need a new tag that is applied after the patchset and reset to that instead if it is present, or could we just reset to HEAD instead when the PATCH function fails? If the resetting to ORIGIN is retained, at least the flag.patchset should be removed in this case.