latest update to BigSur 11.1 broke gcc

[Christopher Jones]

From a combination of my memory, and reading the tickets referenced in the gcc port file, if we don’t use 
—with-sysroot we would need to use --with-build-sysroot in order for the build to work, and last time that was tried it didn’t work correctly.

> On 16 Dec 2020, at 3:37 am, Ken Cunningham <ken.cunningham.webuse at gmail.com> wrote:
> 
> we might just delete this line from the portfile, perhaps:
> 
> 
>  configure.args-append --with-sysroot="${configure.sdkroot}"

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