[Mesa3d-dev] [PATCHes] RFC: detect TLS during configuration

[tom f. <tf...@al...>]

It was a long while back that I wondered && somehow ended up
volunteering to detect platform TLS support, + enable it in Mesa / the
X server if available.

I got distracted before finishing the X parts, but rebased the Mesa
parts, which are attached.

One thing I'm worried about is using an AC macro archive macro here;
it's GPL + an exception that "configure" (the output) is unrestricted.
I'm not sure that'll be kosher for Mesa.

OTOH, the macro is dead simple.

Comments?

-tom