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.

1 files changed, 2 insertions, 2 deletions

diff --git a/configure.in b/configure.in
index c5b27a149e2..2c73e03db46 100644
--- a/configure.in
+++ b/configure.in
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-dnl $PostgreSQL: pgsql/configure.in,v 1.562 2008/05/20 03:30:22 tgl Exp $
+dnl $PostgreSQL: pgsql/configure.in,v 1.563 2008/06/27 00:36:16 tgl Exp $
 dnl
 dnl Developers, please strive to achieve this order:
 dnl
@@ -1699,7 +1699,7 @@ fi
 
 # If compiler will take -Wl,--as-needed then add that to LDFLAGS.
 # This is much easier than trying to filter LIBS to the minimum for each
-# executable.  (Note that shared libraries won't use this switch, though.)
+# executable.  (Note that shared library links won't use this switch, though.)
 # On (at least) some Red-Hat-derived systems, this switch breaks linking to
 # libreadline; therefore we postpone testing it until we know what library
 # dependencies readline has.  The test code will try to link with $LIBS.