dso_dlfcn.c: make it work on Tru64 4.0.

PR: 2316

crypto/dso/dso_dlfcn.c

@@ -85,6 +85,7 @@ DSO_METHOD *DSO_METHOD_dlfcn(void)
 # define HAVE_DLINFO 1
 # if defined(_AIX) || defined(__CYGWIN__) || \
      defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
+     (defined(__osf__) && !defined(RTLD_NEXT))     || \
      (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
 	defined(__ANDROID__)
 #  undef HAVE_DLINFO