xdiff: remove patience and histogram diff algorithms Patience diff is the normal diff algorithm, plus some greediness that unconditionally matches common common unique lines. That means it is easy to construct cases to let it generate suboptimal result, like: ``` open('a', 'w').write('\n'.join(list('a' + 'x' * 300 + 'u' + 'x' * 700 + 'a\n'))) open('b', 'w').write('\n'.join(list('b' + 'x' * 700 + 'u' + 'x' * 300 + 'b\n'))) ``` Patience diff has been advertised as being able to generate better results for some C code changes. However, the more scientific way to do that is the indention heuristic [1]. Since patience diff could generate suboptimal result more easily and its "better" diff feature could be replaced by the new indention heuristic, let's just remove it and its variant histogram diff to simplify the code. [1]: https://github.com/git/git/commit/433860f3d0beb0c6f205290bd16cda413148f098 Test Plan: `gcc -fPIC *.c --shared -o xdiff.so` still builds. Differential Revision: https://phab.mercurial-scm.org/D2573