automake: Link all libGL.so variants with -Bsymbolic.

We were linking src/glx with -Bsymbolic, but not the classic/gallium X11
libGL.so.

But it's always a good idea to build all libGL.so and all DRI drivers
with -Bsymbolic, otherwise they might resolve symbols from the 3rd party
application executable or shared libraries, which is _never_ what we
want.

In particular, this can happen when intercepting OpenGL calls with
apitrace, before
https://github.com/apitrace/apitrace/commit/63194b2573176ef34efce1a5c8b08e624b8dddf5

Cc: [email protected]
Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>

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