Moving away from bminor Github mirrors

Hi,

I'm considering shutting down my Github mirrors (see longer explanation on https://github.com/bminor if you like).

I am very glad that buildroot considered my mirrors to be a trustworthy and reliable source and I don't want to break your project, but you will need to find an alternative solution. I don't have a specific schedule yet, and the mirror will keep running for some time, but I want to shut them down as soon as possible.

Fwiw they are directly referenced in https://gitlab.com/buildroot.org/buildroot/-/blob/master/package/glibc/glibc.mk#L18 and https://gitlab.com/buildroot.org/buildroot/-/blob/master/package/localedef/localedef.mk#L12

Some other patches include URLs to some Github commits, though just for reference. They URLs will likely stop working in the future.

At least I knew that buildroot is using them, so I can write this, but I suspect it's not the only project. Feel free to spread the news or let me know about any other project.