tests: regenerate configure using autoconf patched for AC_PATH_X11

Specifically this patch which does not invoke _AC_PATH_X_XMKMF and
_AC_PATH_X_DIRECT internal autoconf routines when cross-compiling:
http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=33c3a47c04ab70a4dd54963fe433a171bc03747f

Without this, CFLAGS would brokenly have system include paths like
-I/usr/include/X11 when cross-compiling e.g. for windows.  (And it
also resulted in annoying imake crashes for my setup...)

configure

@@ -20178,6 +20178,8 @@ 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

test/configure

@@ -3625,7 +3625,33 @@ else
   $as_echo_n "(cached) " >&6
 else
   # One or both of the vars are not set, and there is no cached value.
-ac_x_includes=no ac_x_libraries=no
+ac_x_includes=no
+ac_x_libraries=no
+# Do we need to do anything special at all?
+ac_save_LIBS=$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
 if mkdir conftest.dir; then
   cd conftest.dir
@@ -3692,6 +3718,8 @@ 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
@@ -3765,15 +3793,17 @@ 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" ;; #(
-  *)
+  *) :
     # 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
 ;; #(