GitLab

Rationale see section 3.5 "Using `autoreconf' to Update `configure'
Scripts" of the autoconf manual.

http://www.gnu.org/software/autoconf/manual/autoconf-2.67/html_node/autoreconf-Invocation.html

Signed-off-by: Jan Engelhardt <jengelh@inai.de>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>