More fixes for bug #12878 with MS-Windows MSVC build.

More fixes for bug #12878 with MS-Windows MSVC build.

 src/xdisp.c (start_hourglass) [HAVE_NTGUI]: Don't mix declaration of
 w32_note_current_window with code.  (Backport from trunk.)
 src/w32.c (FILE_DEVICE_FILE_SYSTEM, METHOD_BUFFERED)
 (FILE_ANY_ACCESS, CTL_CODE, FSCTL_GET_REPARSE_POINT) [_MSC_VER]:
 Define for the MSVC compiler.
 src/w32term.h (EnumSystemLocalesW) [_MSC_VER]: Add a missing
 semi-colon.

 nt/inc/stdint.h (PTRDIFF_MIN) [!__GNUC__]: Define for MSVC.