Mips: Reuse atexit.h from libc/arch-common

Change-Id: Ica1670e6d3d1b6b0c64df93720efa65586e67727
diff --git a/libc/arch-mips64/bionic/atexit.h b/libc/arch-mips64/bionic/atexit.h
index 759008c..b028421 100644
--- a/libc/arch-mips64/bionic/atexit.h
+++ b/libc/arch-mips64/bionic/atexit.h
@@ -26,11 +26,4 @@
  * SUCH DAMAGE.
  */
 
-extern void *__dso_handle;
-extern int __cxa_atexit(void (*func)(void *), void *arg, void *dso);
-
-__attribute__ ((visibility ("hidden")))
-int atexit(void (*func)(void))
-{
-  return (__cxa_atexit((void (*)(void *))func, (void *)0, &__dso_handle));
-}
+#include "../../arch-common/bionic/atexit.h"