libusb-compat: fixup libusb-config script similarly to other *-config scripts

So programs using this don't end up looking for host includes / libraries.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libusb-compat/libusb-compat.mk

@@ -11,4 +11,12 @@ LIBUSB_COMPAT_DEPENDENCIES = host-pkg-config libusb
 LIBUSB_COMPAT_INSTALL_STAGING = YES
 LIBUSB_COMPAT_INSTALL_TARGET = YES
 
+define LIBUSB_COMPAT_FIXUP_CONFIG
+	$(SED) 's%prefix=/usr%prefix=$(STAGING_DIR)/usr%' \
+	    -e 's%exec_prefix=/usr%exec_prefix=$(STAGING_DIR)/usr%' \
+		$(STAGING_DIR)/usr/bin/libusb-config
+endef
+
+LIBUSB_COMPAT_POST_INSTALL_STAGING_HOOKS+=LIBUSB_COMPAT_FIXUP_CONFIG
+
 $(eval $(call AUTOTARGETS,package,libusb-compat))