Add XAudio2 support to the legacy Makefile

src/win/Makefile.mingw

@@ -173,7 +173,7 @@ ifndef DINPUT
  DINPUT		:= n
 endif
 ifndef OPENAL
-OPENAL		:= y
+OPENAL		:= n
 endif
 ifndef FLUIDSYNTH
 FLUIDSYNTH	:= y
@@ -373,9 +373,6 @@ else
  endif
 endif
 
-ifeq ($(OPENAL), y)
-OPTS		+= -DUSE_OPENAL
-endif
 ifeq ($(FLUIDSYNTH), y)
 OPTS		+= -DUSE_FLUIDSYNTH
 FSYNTHOBJ	:= midi_fluidsynth.o
@@ -645,7 +642,6 @@ PRINTOBJ	:= png.o prt_cpmap.o \
 		    prt_escp.o prt_text.o prt_ps.o
 
 SNDOBJ		:= sound.o \
-		    openal.o \
 		    snd_opl.o snd_opl_nuked.o \
 		    snd_resid.o \
 		     convolve.o convolve-sse.o envelope.o extfilt.o \
@@ -736,6 +732,12 @@ else
  PLATOBJ	+= win_joystick_rawinput.o
 endif
 
+ifeq ($(OPENAL), y)
+ SNDOBJ		+= openal.o
+else
+ SNDOBJ		+= xaudio2.o
+endif
+
 OBJ		:= $(MAINOBJ) $(CPUOBJ) $(CHIPSETOBJ) $(MCHOBJ) $(DEVOBJ) $(MEMOBJ) \
 		   $(FDDOBJ) $(GAMEOBJ) $(CDROMOBJ) $(ZIPOBJ) $(MOOBJ) $(HDDOBJ) $(MINIVHDOBJ) \
 		   $(NETOBJ) $(PRINTOBJ) $(SCSIOBJ) $(SIOOBJ) $(SNDOBJ) $(VIDOBJ) $(VOODOOOBJ) \