util-linux: enable AUTORECONF

Commit 55a97378 ("util-linux: link scriptreplay with libm (for isnan)")
added two patches that touch configure.ac and Makemodule.am. But forgot
to enable AUTORECONF.

When AUTORECONF is disabled and configure.ac is patched, it looks like
make will detect change in timestamps and trigger reconfig. But it
later fails because of missing dependencies. To fix this, explicitly
enable AUTORECONF.

Fixes:
  http://autobuild.buildroot.net/results/544/544e8da290d40424ea3d1bffad7e0b8a566de495



Fixes: 55a97378 ("util-linux: link scriptreplay with libm (for isnan)")
Signed-off-by: Rahul Bedarkar <rahul.bedarkar@imgtec.com>
Cc: Carlos Santos <casantos@datacom.ind.br>
Acked-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>