svncommands: get rid of RevMap.readmapfile This is a part of the bigger plan to get rid of reading or writing rev_map directly without going through the RevMap class. Since we have enough pieces to not use RevMap.readmapfile directly, use them in _buildmeta.

include Makefile hgsubversion/help/*.rst tests/fixtures/invalid_utf8.tar.gz
recursive-include tests *.py *.sh *.svndump *.txt