buildgcc: remove getopt when doing clean.

Change-Id: I9f59a00e735f39df813b2216290da62eea3c595d
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/11372
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/crossgcc/buildgcc

@@ -280,6 +280,7 @@ cleanup()
 	for package in $PACKAGES; do
 		rm -rf build-${TARGETARCH}-$package $(eval echo \$$package"_DIR")
 	done
+	rm -f getopt
 	printf "${green}ok${NC}\n"
 }