Make sure SDL gets installed to the correct prefix for the new cross-compiler tools.

configure.in

@@ -2420,7 +2420,7 @@ AC_HELP_STRING([--enable-render-d3d], [enable the Direct3D render driver [[defau
         ARCH=win32
         if test "$build" != "$host"; then # cross-compiling
             # Default cross-compile location
-            ac_default_prefix=/usr/local/cross-tools/i386-mingw32
+            ac_default_prefix=/usr/local/cross-tools/$host
         else
             # Look for the location of the tools and install there
             if test "$BUILD_PREFIX" != ""; then