Avoid compiler warnings on MS-Windows with GCC 6 and 7
* src/w32font.c (SUBRANGE): Use unsigned arithmetic for bit-shifting, to avoid compiler warnings. (w32font_text_extents): Tell GCC NGLYPHS is non-negative, to avoid a warning. For details of the warning, see http://lists.gnu.org/archive/html/emacs-devel/2017-09/msg00093.html. * src/term.c (keys) [WINDOWSNT]: Don't define, as it is not used in that build. * src/sound.c (sound_perror): Ifdef away on WINDOWSNT, as this function is not used in that build. * configure.ac: Disable -Wsuggest-attribute=format on MS-Windows.
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