shared-mime-info: need autoreconf

shared-mime-info: need autoreconf

0001-Remove-incorrect-dependency-from-install-data-hook.patch is
patching Makefile.am, so we need to autoreconf. If we don't do this,
we get build failures such as:

configure.ac:3: error: version mismatch.  This is Automake 1.15.1,
configure.ac:3: but the definition used by this AM_INIT_AUTOMAKE
configure.ac:3: comes from Automake 1.15.  You should recreate
configure.ac:3: aclocal.m4 with aclocal and run automake again.
WARNING: 'automake-1.15' is probably too old.
         You should only need it if you modified 'Makefile.am' or
         'configure.ac' or m4 files included by 'configure.ac'.

Fixes:

  http://autobuild.buildroot.net/results/440c9edd34d56d9207b9f1ee326a14a1c757b27d/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>