Add epoch

src/dusksdl2/time/timeplatform.h

@@ -9,4 +9,5 @@
 #include "timesdl2.h"
 
 #define timeTickPlatform timeTickSDL2
-#define timeGetDeltaPlatform timeGetDeltaSDL2
+#define timeGetDeltaPlatform timeGetDeltaSDL2
+#define timeGetRealPlatform timeGetRealSDL2

src/dusksdl2/time/timesdl2.c

@@ -7,6 +7,7 @@
 
 #include "timesdl2.h"
 #include "assert/assert.h"
+#include <time.h>
 
 void timeTickSDL2(void) {
   TIME_TICKS_LAST_SDL2 = TIME_TICKS_SDL2;