[PATCH v4 09/11] xfsprogs: Add mntent.h check into autoconf

[Christoph Hellwig]

This looks mostly fine.  I think you could just add the
AC_CHECK_HEADERS directly to configure.ac, but otherwise it's exactly
what I though.

Can you please resend all your pending patches in a single series,
and move the UPDATES: lines and other internal changelogs to the
cover letter instead of the patch descriptions?

Thanks for doing this work!