move Ticks initialization tracking to separate function and ensure it's called with SDL_VideoInit is called to init SDL instead of SDL_Init

-- why do we even allow initialization w/o calling at least SDL_Init(0) ?

src/timer/SDL_timer.c

@@ -26,6 +26,8 @@
 #include "SDL_cpuinfo.h"
 #include "SDL_thread.h"
 
+extern void SDL_StartTicks(void);
+
 /* #define DEBUG_TIMERS */
 
 typedef struct _SDL_Timer
@@ -70,6 +72,16 @@ typedef struct {
 
 static SDL_TimerData SDL_timer_data;
 
+static Uint32 ticks_started = 0;
+
+void
+SDL_InitTicks(void)
+{
+    if (!ticks_started) {
+        SDL_StartTicks();
+        ticks_started = 1;
+    }
+}
 
 /* The idea here is that any thread might add a timer, but a single
  * thread manages the active timer queue, sorted by scheduling time.

src/timer/SDL_timer_c.h

@@ -26,6 +26,7 @@
 #define ROUND_RESOLUTION(X)	\
 	(((X+TIMER_RESOLUTION-1)/TIMER_RESOLUTION)*TIMER_RESOLUTION)
 
+extern void SDL_InitTicks(void);
 extern int SDL_TimerInit(void);
 extern void SDL_TimerQuit(void);