Обсуждение: pgsql: Modify the recently-added probe for -Wl,--as-needed some more,

Log Message:
-----------
Modify the recently-added probe for -Wl,--as-needed some more, because RHEL-4
vintage Linux is even more broken than we realized: a link to libreadline
will succeed, and fail only at runtime.  It seems that an AC_TRY_RUN test
is the only reliable way to check whether this is really safe.  Per report
from Tatsuo.

Modified Files:
--------------
    pgsql/config:
        c-compiler.m4 (r1.18 -> r1.19)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/config/c-compiler.m4?r1=1.18&r2=1.19)
    pgsql:
        configure (r1.597 -> r1.598)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.597&r2=1.598)
        configure.in (r1.562 -> r1.563)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.562&r2=1.563)