Remove unused includes

Signed-off-by: Mahyar Koshkouei <mahyar.koshkouei@gmail.com>

mpv-libretro.c

@@ -15,16 +15,10 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <math.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <time.h>
-
-#ifdef HAVE_OPENGLES
-#include <dlfcn.h>
-#endif
 
 #ifdef HAVE_LOCALE
 #include <locale.h>