port: add extra sleep calls to busy loops; separate sleep into system.c

src/include/constants.h

@@ -4722,6 +4722,8 @@ enum weaponnum {
 #define CROSSHAIR_HEALTH_ON_GREEN 1
 #define CROSSHAIR_HEALTH_ON_WHITE 2
 
+#define EXTRA_SLEEP_TIME 1000LL // 100us
+
 #endif
 
 #endif

src/include/data.h

@@ -547,6 +547,7 @@ extern s32 g_BlurFb;
 extern s32 g_BlurFbCapTimer;
 extern bool g_BlurFbDirty;
 extern s32 g_TickRateDiv;
+extern s32 g_TickExtraSleep;
 extern s32 g_MusicDisableMpDeath;
 extern s32 g_BgunGeMuzzleFlashes;
 extern s32 g_FileAutoSelect;