mingw,spec: Bump msitools version
    
    Fedora 24 has GLib 2.48.0, which brings a new dependency: PCRE.
    The new dependency is already added to the wxi file (in msitools) and a
    new msitools build including the fix is already done [0].
    
    Let's just bump the version in our spec file and make sure we will be
    using the msitools which includes the fix.
    
    [0]: https://bodhi.fedoraproject.org/updates/FEDORA-2016-a7a2db6109
    
    Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>
    Acked-by: Eduardo Lima (Etrunko) <etrunko@redhat.com>