Rename "master" branch to "main" for glibc 2.35 release.

[Phil Blundell]

On Sat, Jan 29, 2022 at 05:32:33PM -0500, Carlos O'Donell via Libc-alpha wrote:
> My proposal is to rename the development and release branches at the point
> that glibc 2.35 branches:
> 
> * master -> main
> 
> * release/2.35/master -> release/2.35/main
> 
> No alias would be provided for the master branch; we would immediately
> start using 'main' as the development branch.
> 
> I am looking for consensus on this proposal.

I support this proposal.

Thanks

Phil