mesa: Use -Bsymbolic in the linker to locally resolve Mesa-internal symbols.

mesa: Use -Bsymbolic in the linker to locally resolve Mesa-internal symbols.

Normally, LD_PRELOAD will take precedence over your own symbols, which you
want for things like malloc() in libc.  But we don't have any local
symbols we would want overridden (like hash_table_insert(), for example!),
so tell the linker to resolve them internally.  This also avoids calls
through the PLT.

Saves almost 100k on libdricore's size, and gets us a bunch of the
performance back that we had with non-dricore.

Reviewed-by: Ian Romanick <ian.d.romanick@.intel.com>