gst-plugins-base: add perl runtime dependency to gst-plugins-base-apps

gst-plugins-base-apps contains /usr/bin/gst-visualise-0.10, which is
a perl script.

Note that the gst-visualise-0.10 script was dropped upstream prior to
the first gst-plugins-base 1.0 release:

  http://cgit.freedesktop.org/gstreamer/gst-plugins-base/commit/?id=227be98c0b65a1616c0d0689db6fa7576bcbe434



Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>