my_fflush_all() wasn't doing the right thing under useperlio

on many platforms

p4raw-id: //depot/perl@18335

1 files changed, 1 insertions, 1 deletions

diff --git a/util.c b/util.c
index b58a1b46a9..64cb73811b 100644
--- a/util.c
+++ b/util.c
@@ -2985,7 +2985,7 @@ Perl_get_vtbl(pTHX_ int vtbl_id)
 I32
 Perl_my_fflush_all(pTHX)
 {
-#if defined(FFLUSH_NULL)
+#if defined(USE_PERLIO) || defined(FFLUSH_NULL) || defined(USE_SFIO)
     return PerlIO_flush(NULL);
 #else
 # if defined(HAS__FWALK)