Use RTLD_NOW, not RTLD_LAZY, as binding mode for dlopen() on all platforms.

This restores the Linux behavior to what it was in PG 7.0 and 7.1, and
causes other platforms to agree.  (Other well-tested platforms like HPUX
were doing it this way already.)  Per pghackers discussion over the past
month or so.

src/backend/port/dynloader/netbsd.h

@@ -1,13 +1,13 @@
 /*-------------------------------------------------------------------------
  *
- * port_protos.h
- *	  port-specific prototypes for NetBSD 1.0
+ * netbsd.h
+ *	  port-specific prototypes for NetBSD
  *
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: netbsd.h,v 1.8 2001/11/05 17:46:27 momjian Exp $
+ * $Id: netbsd.h,v 1.9 2002/02/12 23:40:37 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -21,7 +21,6 @@
 
 #include "utils/dynamic_loader.h"
 
-/* dynloader.c */
 /*
  * Dynamic Loader on NetBSD 1.0.
  *
@@ -34,7 +33,21 @@
  * begin with an underscore is fairly tricky, and some versions of
  * NetBSD (like 1.0, and 1.0A pre June 1995) have no dlerror.)
  */
-#define		   pg_dlopen(f)    BSD44_derived_dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define		   pg_dlopen(f)    BSD44_derived_dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define		   pg_dlsym		   BSD44_derived_dlsym
 #define		   pg_dlclose	   BSD44_derived_dlclose
 #define		   pg_dlerror	   BSD44_derived_dlerror