Also save/restore fpu register in vbl interrupt

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%402198

src/timer/mint/SDL_systimer.c

@@ -48,6 +48,9 @@
 
 #include "SDL_vbltimer_s.h"
 
+/* from audio/mint */
+void SDL_MintAudio_CheckFpu(void);
+
 /* The first ticks value of the application */
 static Uint32 start;
 static SDL_bool supervisor;
@@ -119,6 +122,8 @@ int SDL_SYS_TimerInit(void)
 
 	supervisor=SDL_FALSE;
 
+	SDL_MintAudio_CheckFpu();
+
 	/* Install RunTimer in vbl vector */
 	oldpile=(void *)Super(0);
 	timer_installed = !SDL_AtariVblInstall(RunTimer);