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>

2 files changed, 16 insertions, 0 deletions

diff --git a/profiles/base/package.use.force b/profiles/base/package.use.force
index 3396175ed2bd..cdffaf3b2059 100644
--- a/profiles/base/package.use.force
+++ b/profiles/base/package.use.force
@@ -1,6 +1,14 @@
 # Copyright 1999-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
+# Ionen Wolkens <ionen@gentoo.org> (2023-07-26)
+# MPV currently[1] has no plans to support >=lua5-3 making luajit
+# the only choice for maintained lua. Apply mask/force to override
+# the profile's defaults, and invert on arches where not keyworded.
+# Done this way also avoids conflicts for users using another default.
+# [1] https://github.com/mpv-player/mpv/wiki/FAQ#why-does-mpv-not-support-lua-53-or-newer
+media-video/mpv lua_single_target_luajit
+
 # Joonas Niilola <juippis@gentoo.org> (2023-07-21)
 # -system-librnp is currently broken with upstream package.
 >=mail-client/thunderbird-115.0 system-librnp
diff --git a/profiles/base/package.use.mask b/profiles/base/package.use.mask
index d650ded1043b..f9334180fdd1 100644
--- a/profiles/base/package.use.mask
+++ b/profiles/base/package.use.mask
@@ -6,6 +6,14 @@
 # This file is only for generic masks. For arch-specific masks (i.e.
 # mask everywhere, unmask on arch/*) use arch/base.
 
+# Ionen Wolkens <ionen@gentoo.org> (2023-07-26)
+# MPV currently[1] has no plans to support >=lua5-3 making luajit
+# the only choice for maintained lua. Apply mask/force to override
+# the profile's defaults, and invert on arches where not keyworded.
+# Done this way also avoids conflicts for users using another default.
+# [1] https://github.com/mpv-player/mpv/wiki/FAQ#why-does-mpv-not-support-lua-53-or-newer
+media-video/mpv lua_single_target_lua5-1
+
 # Hans de Graaff <graaff@gentoo.org> (2023-07-21)
 # jemalloc has been a source of sometimes hard to track bugs in the
 # past. It is now masked with the intention to remove it altogether at a