Remove the C99 "ULL" suffix from the 64bit unsigned long constants.

VC++6 doesn't accept them.

This *will* result in tons of the following warning from gcc 3.x:
(gcc "2.96ish" doesn't issue this warning)

 warning: integer constant is too large for "long" type

the code compiles fine regardless.  squashing the gcc warnings
is the next task.

Would someone on windows please confirm that this does or does not
compile and if it does or does not pass the test_hashlib.py unit
tests.