Updated SDL to version 2.0.15 for development

test/configure

@@ -3603,34 +3603,8 @@ else
   $as_echo_n "(cached) " >&6
 else
   # One or both of the vars are not set, and there is no cached value.
-ac_x_includes=no
-ac_x_libraries=no
-# Do we need to do anything special at all?
-ac_save_LIBS=$LIBS
-LIBS="-lX11 $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <X11/Xlib.h>
-int
-main ()
-{
-XrmInitialize ()
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  # We can compile and link X programs with no special options.
-  ac_x_includes=
-  ac_x_libraries=
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS="$ac_save_LIBS"
-# If that didn't work, only try xmkmf and filesystem searches
-# for native compilation.
-if test x"$ac_x_includes" = xno && test "$cross_compiling" = no; then :
-  rm -f -r conftest.dir
+ac_x_includes=no ac_x_libraries=no
+rm -f -r conftest.dir
 if mkdir conftest.dir; then
   cd conftest.dir
   cat >Imakefile <<'_ACEOF'
@@ -3669,7 +3643,7 @@ _ACEOF
   rm -f -r conftest.dir
 fi
 
-  # Standard set of common directories for X headers.
+# Standard set of common directories for X headers.
 # Check X11 before X11Rn because it is often a symlink to the current release.
 ac_x_header_dirs='
 /usr/X11/include
@@ -3696,8 +3670,6 @@ ac_x_header_dirs='
 /usr/local/include/X11R5
 /usr/local/include/X11R4
 
-/opt/X11/include
-
 /usr/X386/include
 /usr/x386/include
 /usr/XFree86/include/X11
@@ -3771,17 +3743,15 @@ rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
 fi # $ac_x_libraries = no
 
-fi
-# Record the results.
 case $ac_x_includes,$ac_x_libraries in #(
-  no,* | *,no | *\'*) :
+  no,* | *,no | *\'*)
     # Didn't find X, or a directory has "'" in its name.
-    ac_cv_have_x="have_x=no" ;; #(
-  *) :
+    ac_cv_have_x="have_x=no";; #(
+  *)
     # Record where we found X for the cache.
     ac_cv_have_x="have_x=yes\
 	ac_x_includes='$ac_x_includes'\
-	ac_x_libraries='$ac_x_libraries'" ;;
+	ac_x_libraries='$ac_x_libraries'"
 esac
 fi
 ;; #(