Use -Bsymbolic when linking libEGL.so

For some reason that I don't yet fully understand, Glaze does not work with
libEGL unless libEGL is linked with -Bsymbolic.[*]

Beyond that specific reason, all of the reasons for which libGL.so is linked
with -Bsymbolic, (see the commit history), should also apply here.

[*] The specific behavior I am seeing is that when Glaze calls dlopen for
libEGL.so, ifunc resolvers within Glaze for EGL functions are called before
the dlopen returns. These resolvers cannot succeed, as they need the return
value from dlopen in order to find the functions to resolve to. I don't know
what's causing these resolvers to be called, but I have verified that linking
libEGL with -Bsymbolic causes this problematic behavior to stop.

CC: "9.1 and 9.2" <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Chad Versace <[email protected]>

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