mingw-libvirt.spec.in: add perl + perl(Getopt::Long) BRs

The default Fedora build roots for f25 and newer no longer
include perl. We must thus explicitly ask for it as the
RPC gendispatch.pl program needs it, and the Getopt::Long
module. Do this unconditionally since it isn't harmful for
older Fedora
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

mingw-libvirt.spec.in

@@ -54,6 +54,8 @@ BuildRequires:  mingw64-portablexdr
 BuildRequires:  pkgconfig
 # Need native version for msgfmt
 BuildRequires:  gettext
+BuildRequires:  perl
+BuildRequires:  perl(Getopt::Long)
 %if 0%{?enable_autotools}
 BuildRequires: autoconf
 BuildRequires: automake