Commits on Feb 1, 2023

1. gcc/common/configure-flags.nix: fix comment …

   On a native (host==build==target) build, `${with_build_sysroot}` can
   be omitted.  In that case, the line modified by this commit is
   correct.
   
   However, if `--with-build-sysroot=` is passed to `./configure`, then
   `${with_build_sysroot}` will be used, similar to the cross case, and
   the headers will be taken from:
   
     ${with_build_sysroot}${native_system_header_dir}
   
   See:
   
     https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/configure.ac;h=62bc908b991ff0b700225aef32743cd3d7c4daaf;hb=HEAD#l2439
   
   This commit adjusts the comment to account for the case where
   `--with-build-sysroot` is passed to a native compiler.

   Adam Joseph committed Feb 1, 2023
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