MSVC and Windows SDK compatibility

src/sound/snd_adlibgold.c

@@ -641,7 +641,8 @@ void adgold_timer_poll(void *p)
 static void adgold_get_buffer(int32_t *buffer, int len, void *p)
 {
         adgold_t *adgold = (adgold_t *)p;
-        int16_t adgold_buffer[len*2];
+	int16_t* adgold_buffer = malloc(sizeof(int16_t) * len * 2);
+	if (adgold_buffer == NULL) fatal("adgold_buffer = NULL");
         
         int c;
 
@@ -747,6 +748,8 @@ static void adgold_get_buffer(int32_t *buffer, int len, void *p)
 
         adgold->opl.pos = 0;
         adgold->pos = 0;
+
+	free(adgold_buffer);
 }
 
 

src/sound/snd_audiopci.c

@@ -3,6 +3,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>
+#define _USE_MATH_DEFINES
 #include <math.h>
 #define HAVE_STDARG_H
 #include <86box/86box.h>

src/sound/snd_emu8k.c

@@ -5,6 +5,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <wchar.h>
+#define _USE_MATH_DEFINES
 #include <math.h>
 #define HAVE_STDARG_H
 #include <86box/86box.h>

src/sound/snd_sb_dsp.c

@@ -4,6 +4,7 @@
   486-50 - 32kHz
   Pentium - 45kHz*/
 
+#define _USE_MATH_DEFINES
 #include <math.h>
 #include <stdarg.h>
 #include <stdint.h>