egl/wayland: don't populate dri2_dpy->swrast_loader_extension
egl/wayland: don't populate dri2_dpy->swrast_loader_extension

Similar to the dri2 one - the extension stored in struct
dri2_egl_display is unused.

Signed-off-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>
Reviewed-by: Eric Engestrom <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@engestrom.ch>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler