Export only the symbol named auth_gssapi_module
Export only the symbol named auth_gssapi_module

The only entry point into the module DSO is the module structure itself;
use libtool's export-symbols linker trick to hide all the other global
symbols, which otherwise are potentially visible outside the module
itself (SEAL_* etc).

Reviewed-by: Simo Sorce <65f99581a93cf30dafc32b5c178edc6b0294a07f@redhat.com>

devurandom/mod_auth_gssapi,frenche/mod_auth_gssapi,uhd-urz/mod_auth_gssapi,devurandom/mod_auth_gssapi,devurandom/mod_auth_gssapi,frenche/mod_auth_gssapi,davisd123/mod_auth_gssapi,davisd123/mod_auth_gssapi,uhd-urz/mod_auth_gssapi,frenche/mod_auth_gssapi,uhd-urz/mod_auth_gssapi,davisd123/mod_auth_gssapi,frenche/mod_auth_gssapi