Sometimes we like to make grep auto-highlight the match text by setting the GREP_OPTIONS. This will make the compare_output in lint-002 catch the difference between 2 strings which text are same but color are different. Override the GREP_OPTIONS. Change-Id: Ia257214fe5149e084e8eac3fb551a494eaa46ae6 Signed-off-by: Zheng Bao <zheng.bao@amd.com> Signed-off-by: Zheng Bao <fishbaozi@gmail.com> Reviewed-on: http://review.coreboot.org/1526 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>