usb_modeswitch: update config.guess / config.sub

Fixes:
http://autobuild.buildroot.net/results/fbe/fbe21bd173e6566dd93dddd58d4a848de8a3465e/

The build system of the embedded jimtcl copy doesn't use autotools, but does
use an old version of gnuconfig which doesn't know all the architectures
supported by Buildroot, so update config.guess / config.sub like we do in
pkg-autotools.mk

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/usb_modeswitch/usb_modeswitch.mk

@@ -20,6 +20,12 @@ USB_MODESWITCH_BUILD_TARGETS = script
 USB_MODESWITCH_INSTALL_TARGETS = install-script
 endif
 
+# build system of embedded jimtcl doesn't use autotools, but does use
+# an old version of gnuconfig which doesn't know all the architectures
+# supported by Buildroot, so update config.guess / config.sub like we
+# do in pkg-autotools.mk
+USB_MODESWITCH_POST_PATCH_HOOKS += UPDATE_CONFIG_HOOK
+
 define USB_MODESWITCH_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) $(TARGET_CONFIGURE_OPTS) \
 		CFLAGS="$(TARGET_CFLAGS) -D_GNU_SOURCE -Wall -I." \