configure: Symlink binaries using .exe suffix with MinGW

When using the MinGW toolchain, we use the .exe suffix for the
executable name. We also need to use it for the symlinks in the
build directory.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20211109144504.1541206-1-philmd@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

configure

@@ -3754,7 +3754,7 @@ fi
 
 for target in $target_list; do
     target_dir="$target"
-    target_name=$(echo $target | cut -d '-' -f 1)
+    target_name=$(echo $target | cut -d '-' -f 1)$EXESUF
     mkdir -p $target_dir
     case $target in
         *-user) symlink "../qemu-$target_name" "$target_dir/qemu-$target_name" ;;