dri: test whether the built drivers have unresolved symbols

This is a different approach to solving this problem that the patch
I previously posted, and unlike that, should not cause any problems.

Right now undefined symbols in DRI drivers will still allow the
build to succeed.

As a result, people modifying drivers they cannot test risk creating
unloadable drivers with no easy way of automatically avoiding it.

For instance, the modifications to nv50 for context transfers caused
such an issue recently.

Unfortunately, just adding -Wl,--no-undefined doesn't work, because
the DRI drivers depend on glapi symbols, but do not depend on
libGL.so.1

Adding -lGL is not the correct solution since DRI drivers are not loaded
just by libGL, but also by X and possibly by other clients.

So, this patch simply tries to build an executable linked to the DRI
driver and to libGL.
If the DRI driver contains any undefined symbols not satisfied by its
dependencies or by libGL, this will fail.

This solution does not alter the built drivers, and does not significantly
slow down the build process.

All classic DRI drivers as well as all the Gallium drivers with configure
options compiled successfully with this change.

Thanks to Xavier Chantry <[email protected]> and
Michel Daenzer <[email protected]> for helping with this.

Signed-off-by: Luca Barbieri <[email protected]>
Acked-by: Brian Paul <[email protected]>

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