Resurrect sound support on MS-Windows that was lost in transition.

 configure.ac (HAVE_SOUND): Check for mmsystem.h header that
 defines the sound stuff on MS-Windows.  (Bug#18463)

ChangeLog

+2014-09-13  Eli Zaretskii  <eliz@gnu.org>
+
+	* configure.ac (HAVE_SOUND): Check for mmsystem.h header that
+	defines the sound stuff on MS-Windows.  (Bug#18463)
+
 2014-08-22  Ken Brown  <kbrown@cornell.edu>
 
 	* configure.ac (HAVE_XPM): Explain the use of CPPFLAGS in the

configure.ac

@@ -1398,7 +1398,7 @@ AC_DEFUN([PKG_CHECK_MODULES], [
 HAVE_SOUND=no
 if test "${with_sound}" != "no"; then
   # Sound support for GNU/Linux, the free BSDs, and MinGW.
-  AC_CHECK_HEADERS([machine/soundcard.h sys/soundcard.h soundcard.h],
+  AC_CHECK_HEADERS([machine/soundcard.h sys/soundcard.h soundcard.h mmsystem.h],
     have_sound_header=yes, [], [
     #ifdef __MINGW32__
     #define WIN32_LEAN_AND_MEAN