This doesn't change generated code with any USE combo,
but makes configure output cleaner with USE=-opengl.
Package-Manager: Portage-2.3.3, Repoman-2.3.1
Closes: https://github.com/gentoo/gentoo/pull/3351
$(use_enable jpeg)
--disable-android
$(use_enable raspberry-pi rpi)
+ $(usex opengl "$(use_enable !aqua standard-gl)" '--disable-standard-gl')
--disable-ios-gl
$(usex libmpv "$(use_enable opengl plain-gl)" '--disable-plain-gl')
--disable-mali-fbdev # Only available in overlays.