Change in coreboot[master]: buildgcc: Hide stderr output of getopt test

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Change subject: buildgcc: Hide stderr output of getopt test
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/64127/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/18958/ : SUCCESS

https://qa.coreboot.org/job/coreboot-toolchain/391/ : SUCCESS