Hook up SDL_acos and SDL_asin properly.

configure

@@ -16628,7 +16628,7 @@ if test "x$ac_cv_lib_m_pow" = xyes; then :
   LIBS="$LIBS -lm"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lm"
 fi
 
-    for ac_func in atan atan2 ceil copysign cos cosf fabs floor log pow scalbn sin sinf sqrt
+    for ac_func in atan atan2 acos asin ceil copysign cos cosf fabs floor log pow scalbn sin sinf sqrt
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"