[issue7546] msvc9compiler.py: add .asm extension

[Stefan Krah]

Stefan Krah <stefan-usenet at bytereef.org> added the comment:

I have a new patch with tests, but I'm not quite satisfied with it.

The remaining problem is that the choice of ml64 or ml is fragile
if a user has executed `vcvarsall xyz`, and we attempt to use the
resulting environment.

For example, if `vcvarsall amd64` has been executed once in a command
line window, a subsequent `vcvarsall x86` will not reset the environment
sufficiently, so ml64 is detected and the x86 build will fail.


But in general this patch should work.

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Added file: http://bugs.python.org/file18681/vcasm2.patch

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