Merged revisions 79115,79424,79491 via svnmerge from

Merged revisions 79115,79424,79491 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/branch_libffi-3_0_10-win

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  r79115 | thomas.heller | 2010-03-19 22:14:47 +0100 (Fr, 19 Mrz 2010) | 7 lines

  Work in progress.  2 tests fail on x86/win32 because the stack
  checking code in ffi_call_win32 is not yet implemented.

  Remove most files from _ctypes/libffi_msvc, only two include files
  stay (updated from _ctypes/libffi/...).  Other files are used in the
  cross-platform _ctypes/libffi directory.
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  r79424 | thomas.heller | 2010-03-25 19:28:02 +0100 (Do, 25 Mrz 2010) | 1 line

  Build _ctypes on Win64.
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  r79491 | thomas.heller | 2010-03-29 21:30:33 +0200 (Mo, 29 Mrz 2010) | 4 lines

  On Windows, ctypes does no longer check the stack before and after
  calling a foreign function.
  This allows to use the unmodified libffi library.
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