Don't include cpu.h in timer.h

Change the name of the define used to indicate SVGA multi-monitor-capable cards

src/sound/snd_audiopci.c

@@ -39,6 +39,7 @@
 #include <86box/pci.h>
 #include <86box/snd_ac97.h>
 #include <86box/sound.h>
+#include "cpu.h"
 #include <86box/timer.h>
 #include <86box/plat_unused.h>
 #include <86box/snd_akm4531.h>

src/sound/snd_gus.c

@@ -15,6 +15,7 @@
 #include <86box/nmi.h>
 #include <86box/pic.h>
 #include <86box/sound.h>
+#include "cpu.h"
 #include <86box/timer.h>
 #ifdef USE_GUSMAX
 #    include <86box/snd_ad1848.h>

src/sound/snd_opl_esfm.c

@@ -32,6 +32,7 @@
 #include <86box/86box.h>
 #include <86box/sound.h>
 #include <86box/device.h>
+#include "cpu.h"
 #include <86box/timer.h>
 #include <86box/snd_opl.h>
 #include <86box/plat_unused.h>

src/sound/snd_opl_nuked.c

@@ -46,6 +46,7 @@
 #define HAVE_STDARG_H
 #include <86box/86box.h>
 #include <86box/sound.h>
+#include "cpu.h"
 #include <86box/timer.h>
 #include <86box/device.h>
 #include <86box/snd_opl.h>

src/sound/snd_sb.c

@@ -39,6 +39,7 @@
 #include <86box/pic.h>
 #include <86box/rom.h>
 #include <86box/sound.h>
+#include "cpu.h"
 #include <86box/timer.h>
 #include <86box/snd_sb.h>
 #include <86box/plat_unused.h>