pgsql: Code review for recent libpq changes.

Log Message:
-----------
Code review for recent libpq changes.  Be more careful about error
handling in SIGPIPE processing; avoid unnecessary pollution of application
link-symbol namespace; spell 'pointer to function' in the conventional
way.

Modified Files:
--------------
    pgsql/src/interfaces/libpq:
        fe-connect.c (r1.291 -> r1.292)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/fe-connect.c.diff?r1=1.291&r2=1.292)
        fe-print.c (r1.56 -> r1.57)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/fe-print.c.diff?r1=1.56&r2=1.57)
        fe-secure.c (r1.58 -> r1.59)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/fe-secure.c.diff?r1=1.58&r2=1.59)
        libpq-fe.h (r1.114 -> r1.115)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/libpq-fe.h.diff?r1=1.114&r2=1.115)
        libpq-int.h (r1.97 -> r1.98)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/libpq-int.h.diff?r1=1.97&r2=1.98)