media-video/totem-3.32: ebuild touchups

media-video/totem-3.32: ebuild touchups

* Port to EAPI-7 (BDEPEND + removal of obsolete gnome2_icon_cache_update).
* Drop USE=nautilus and always build save-file plugin (it communicates
  with nautilus via dbus only at runtime).
* Fix tests (an actual first test was added, needing virtx)
* Drop X11 requirements - it will add minimal things for X automagically
  at build time based on gtk+[X] being around or not during build; which
  is the unfortunate status quo elsewhere as well. This change however
  should allow using totem on a pure-wayland system. The libX11 dep is
  also dropped for this, but we can rely on it being there whenever it
  is needed.
* User help got ported to pure its, so now docbook-xml-dtd:4.5 should
  only be necessary for gtk-doc.
* Resort enabled plugin list and drop obsolete comments.
* Restore -Dgst-inspect=false to avoid sandbox issues
* Drop unnecessary src_prepare(), as only xdg_src_prepare is called now,
  which will be the case without src_prepare() in ebuild too.

Package-Manager: Portage-2.3.69, Repoman-2.3.12
Signed-off-by: Mart Raudsepp <leio@gentoo.org>