Integrate #16510 from macperl;

Tell IO.xs that MacOS sometimes doesn't need extra help

p4raw-id: //depot/perl@16522
p4raw-integrated: from //depot/macperl@16521 'copy in' ext/IO/IO.xs
	(@16230..)

diff --git a/ext/IO/IO.xs b/ext/IO/IO.xs
index 26b332b..4f713a0 100644 (file)
--- a/ext/IO/IO.xs
+++ b/ext/IO/IO.xs
@@ -26,7 +26,7 @@
 #endif
 
 #ifdef PerlIO
-#ifdef MACOS_TRADITIONAL
+#if defined(MACOS_TRADITIONAL) && defined(USE_SFIO)
 #define PERLIO_IS_STDIO 1
 #undef setbuf
 #undef setvbuf