meson: fix building skins2 on OpenBSD

Library X11 found: NO

and as expected X11_SKINS was not defined.

../modules/gui/skins2/src/os_factory.cpp:46:2: error: "No OSFactory implementation !"
 ^
1 error generated.

There is already an X11 check and it works as expected so use that for the dependency checking.

added MRStatus::Reviewable label

changed milestone to %4.0

added Component::Build system: Meson label

mentioned in merge request !6857 (merged)

approved this merge request

added MRStatus::Acceptable label and removed MRStatus::Reviewable label

added MRStatus::Accepted label and removed MRStatus::Acceptable label

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added 80 commits

• a2b8091a...22ea21dc - 80 commits from branch videolan:master

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added MRStatus::NotCompliant label and removed MRStatus::Accepted label

Was merged in !6857 (merged)

closed