Change in coreboot[master]: buildgcc: Update GCC to 7.1.0

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/20809 )

Change subject: buildgcc: Update GCC to 7.1.0
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Patch Set 2:

Build Unstable

https://qa.coreboot.org/job/coreboot-toolchain/346/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-gerrit/58004/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13439/ : SUCCESS