pgsql: Don't unblock SIGQUIT in the SIGQUIT handler This was possibly

Log Message:
-----------
Don't unblock SIGQUIT in the SIGQUIT handler

This was possibly linked to a deadlock-like situation in glibc syslog code
invoked by the ereport call in quickdie().  In any case, a signal handler
should not unblock its own signal unless there is a specific reason to.

Modified Files:
--------------
    pgsql/src/backend/tcop:
        postgres.c (r1.577 -> r1.578)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/postgres.c?r1=1.577&r2=1.578)
    pgsql/src/include/libpq:
        pqsignal.h (r1.35 -> r1.36)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/libpq/pqsignal.h?r1=1.35&r2=1.36)