[PATCH][win32] problems compiling bzrlib/_dirstate_helpers_c.pyx with MSVC

[Alexander Belchenko]

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John,
I have troubles to compiling bzrlib/_dirstate_helpers_c.pyx on Windows with MSVC2003.
Actually generated C-file is incompatible with MSVC in 2 cases:

1) you're using #include <stdint.h>, but MSVC is not C99 compiler, and don't have such
header.

	Actually you need only `typedef int intptr_t` from this header,
	but Pyrex is smart enough to substitute intptr_t with int in
	generated C-code, so actually stdint.h is not used at all.

2) in function _py_memrchr you're calculate difference between 2 void* pointers,
but MSVC don't allow arithmetic operations for void* pointers.

	Actually these pointers are pointers to strings, i.e. char*,
	but for some reason you're using void*. Explicit cast to char*
	solve this problem.

After I make 2 little changes (diff attached) I can successfully compile pyx
and run the tests. All tests related to dirstate_helpers are passed.

Please, take a look on my patch.

- --
[µ]

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