latest update to BigSur 11.1 broke gcc

[Ken Cunningham]

> --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk

gcc is supposed to respond to the SDKROOT env var now, and base sets this (most of the time … sigh).

perhaps we should find a way to stop baking in —with-sysroot altogether now…

Ken
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