profiles: have media-video/mpv use luajit more thoroughly

tl;dr fixes RequiredUseDefaults, and also uses luajit on non-desktop

mpv currently no plans to ever support >=lua5-3, and with lua5-1 being
essentially unmaintained it's preferred to use the actively maintained
luajit when possible.

Because of this, wanted to straight up remove lua5-1 from COMPAT, but
then luajit is not available on as many arches as lua5-1.

So to pick luajit by default (against's profile defaults), there is
two options:
(1). package.use in profile with -lua5-1 luajit
(2). mask lua5-1, force luajit
And fortunately we don't need to worry about LUA_TARGETS, just SINGLE.

Old situation is sub-optimal:
- (1) is used in desktop profile only (should be all)
- arches which don't support luajit have bad REQUIRED_USE defaults
 (should be inverted where needed)

(2) has a big advantage, if users set their own default e.g.
    */* LUA_SINGLE_TARGET: -* lua5-4
Then luajit will still be forced and they do not need a package.use
entry to emerge mpv.

Downside is that if a user really want to use old lua5-1, then
they need to mess with /etc/portage/profile. But generally I feel
(2) is still better for the general user experience, and this
commit does that.

wrt old "lua" default, not needed in profile given IUSE=+lua default
is in all mpv ebulds already (-sdl still makes sense).

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

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