Convert ticks to 64-bit, added nanosecond precision to the API

Fixes https://github.com/libsdl-org/SDL/issues/5512
Fixes https://github.com/libsdl-org/SDL/issues/6731

src/thread/ngage/SDL_syssem.cpp

@@ -100,19 +100,27 @@ void SDL_DestroySemaphore(SDL_sem *sem)
     }
 }
 
-int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
+int SDL_SemWaitTimeoutNS(SDL_sem *sem, Sint64 timeoutNS)
 {
     if (sem == NULL) {
         return SDL_InvalidParamError("sem");
     }
 
-    if (timeout == SDL_MUTEX_MAXWAIT) {
+    if (timeoutNS == 0) {
+        if (sem->count > 0) {
+            --sem->count;
+            return 0;
+        }
+        return SDL_MUTEX_TIMEOUT;
+    }
+
+    if (timeoutNS == SDL_MUTEX_MAXWAIT) {
         WaitAll(sem);
-        return SDL_MUTEX_MAXWAIT;
+        return 0;
     }
 
     RThread thread;
-    TInfo *info = new (ELeave) TInfo(timeout, sem->handle);
+    TInfo *info = new (ELeave) TInfo((TInt)SDL_NS_TO_MS(timeoutNS), sem->handle);
     TInt status = CreateUnique(NewThread, &thread, info);
 
     if (status != KErrNone) {
@@ -130,23 +138,6 @@ int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
     return info->iVal;
 }
 
-int SDL_SemTryWait(SDL_sem *sem)
-{
-    if (sem == NULL) {
-        return SDL_InvalidParamError("sem");
-    }
-
-    if (sem->count > 0) {
-        sem->count--;
-    }
-    return SDL_MUTEX_TIMEOUT;
-}
-
-int SDL_SemWait(SDL_sem *sem)
-{
-    return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
-}
-
 Uint32
 SDL_SemValue(SDL_sem *sem)
 {