the newlib/libgloss configure scripts use both libc_cv_ and newlib_cv_ as
their autoconf cache var prefixes.  this really should be just one name.
i'm inclined to use newlib_cv_ rather than the more generic libc_cv_.  any
preferences or reasons to pick one or the other ?

libgloss also has cache vars.  i'm inclined to have it use newlib_cv_ too
since, as a project, it's carved out the namespace, and doesn't really need
its own libgloss_cv_ prefix.
-mike