pgsql: Make an attempt at fixing our current Solaris 11 breakage: add a

Log Message:
-----------
Make an attempt at fixing our current Solaris 11 breakage: add a configure
probe for opterr (exactly like the one for optreset) and have getopt.c
define the variables only if configure doesn't find them in libc.

Modified Files:
--------------
    pgsql:
        configure (r1.634 -> r1.635)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.634&r2=1.635)
        configure.in (r1.592 -> r1.593)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.592&r2=1.593)
    pgsql/src/include:
        pg_config.h.in (r1.138 -> r1.139)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.in?r1=1.138&r2=1.139)
    pgsql/src/port:
        getopt.c (r1.11 -> r1.12)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/port/getopt.c?r1=1.11&r2=1.12)