The test_pass_pointer and test_int_pointer_arg tests are inconsistent between 32-bit and 64-bit builds because c_long is always 32 bits but the function being called may return a 64-bit value (it's a pointer, so c_long may truncate it).

I'd prefer to have a c_intptr type to use, but this patch uses c_longlong in the test if that's the size of a pointer.

Just looking for a quick review so I can check this into default. Not sure why it doesn't repro with VC10, but it certainly does with later compilers.