temp/mesa: enable mesa-dri-lima subpackage
temp/mesa: add a fix for Wayland on Lima
temp/mesa-purism-gc7000: update to latest Git and try to resolve conflicts with mesa
temp/mesa: switch version to 19.1.0-rc1
device/device-pine-a64lts: add mesa and mesa-dri-lima to depends
device/device-pine-dontbeevil: add mesa to depends
device/device-purism-librem5dev: remove now defunct mesa-purism-gc7000-dri-imx from depends
temp/mesa*: re-add X11 support
temp/mesa-purism-gc7000: fix build error which for some reason didn't cause problems earlier
temp/mesa*: fix X11 DRI symlinks
