lavapipe: add support for non-dri loader on linux

Merged Dave Airlie requested to merge airlied/mesa:lavapipe-no-dri-sw into master

If you build --glx=gallium-xlib then lavapipe will fail to link this should let it use the non-dri paths on Linux in that case

@brianp this should build in the use case you mentioned -Dplatforms=x11 -Dvulkan-drivers=swrast -Dglx=gallium-xlib -Dgallium-drivers=swrast -Ddri-drivers=

Edited by Dave Airlie

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