disable user targets by default for cross compile with mingw32

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2014 c046a42c-6fe2-441c-8c8c-71466251a162

configure

@@ -213,7 +213,7 @@ for opt do
   ;;
   --fmod-inc=*) fmod_inc="$optarg"
   ;;
-  --enable-mingw32) mingw32="yes" ; cross_prefix="i386-mingw32-"
+  --enable-mingw32) mingw32="yes" ; cross_prefix="i386-mingw32-" ; user="no"
   ;;
   --disable-slirp) slirp="no"
   ;;