Overwrite any existing link should there be one

toolchain/gdb/gdb.mk

@@ -164,7 +164,7 @@ $(GDB_CLIENT_DIR)/gdb/gdb: $(GDB_CLIENT_DIR)/.configured
 
 $(TARGET_CROSS)gdb: $(GDB_CLIENT_DIR)/gdb/gdb
 	install -c $(GDB_CLIENT_DIR)/gdb/gdb $(TARGET_CROSS)gdb
-	ln -s ../../bin/$(REAL_GNU_TARGET_NAME)-gdb \
+	ln -fs ../../bin/$(REAL_GNU_TARGET_NAME)-gdb \
 		$(STAGING_DIR)/$(REAL_GNU_TARGET_NAME)/bin/gdb
 
 gdbclient: $(TARGET_CROSS)gdb