egl/surfaceless: remove unused dri2_loader_extension implementation
egl/surfaceless: remove unused dri2_loader_extension implementation

Earlier commit introduced support for image_loader and left the
dri2_loader code dangling/unused. Let's remove it.

Fixes: 63c5d5c6c46 ("Added pbuffer hooks for surfaceless platform")
Signed-off-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>
Reviewed-by: Gurchetan Singh <99434bba058e25b6203b8ae055a4f697dad0ef64@chromium.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler