build modifies config.guess and config.sub

[Perry E. Metzger]

Howdy, all!

Whenever I do a "git status" after cleaning up after a build, I learn 
that the files

build-aux/config.guess
build-aux/config.sub

have been modified. It's easy enough to do a "git restore" on them, but 
should they should actually be checked in? I thought they were supplied 
by the autotools?

Perry