[Bug 795107] Meson: missing option to enable/disable plugins

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795107

--- Comment #6 from Xavier Claessens <xclaesse at gmail.com> ---
About global option to switch all "not-required" to either "required" or
"disabled", if I'm not mistaken it could work like this:

meson_options.txt:
option('group_switch', type: 'dependency', value: 'not-required')

ext/cairo/meson.build:
opt = get_option('cairo') or get_option('group_switch')

I think the "or" operator works like this:
required, required => required
required, not-required => required
required, disabled => disabled

no-required, required => required
no-required, not-required => not-required
no-required, disabled => disabled

disabled, required => disabled
disabled, not-required => disabled
disabled, disabled => disabled

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