[Bug c/90653] --with-build-sysroot= not honored for ./configure C compiler checks.

[kallisti5 at unixzen dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90653

--- Comment #6 from Alexander von Gluck <kallisti5 at unixzen dot com> ---
Created attachment 46424
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46424&action=edit
gcc8-verbose.txt