pgsql: Change libpq's PQgetssl() to return a void*, rather than SSL *,

Log Message:
-----------
Change libpq's PQgetssl() to return a void*, rather than SSL *, so that
applications don't need the SSL headers.

Martijn van Oosterhout

Modified Files:
--------------
    pgsql/src/interfaces/libpq:
        fe-secure.c (r1.76 -> r1.77)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/fe-secure.c.diff?r1=1.76&r2=1.77)
        libpq-fe.h (r1.126 -> r1.127)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/libpq-fe.h.diff?r1=1.126&r2=1.127)