hide purely dependency-triggering functions in stdio __toread & __towrite
diff --git a/src/stdio/__toread.c b/src/stdio/__toread.c
index 8f9f27b..309ee6e 100644
--- a/src/stdio/__toread.c
+++ b/src/stdio/__toread.c
@@ -13,7 +13,7 @@
 	return (f->flags & F_EOF) ? EOF : 0;
 }
 
-void __toread_needs_stdio_exit()
+hidden void __toread_needs_stdio_exit()
 {
 	__stdio_exit_needed();
 }
diff --git a/src/stdio/__towrite.c b/src/stdio/__towrite.c
index 0199867..4c9c66a 100644
--- a/src/stdio/__towrite.c
+++ b/src/stdio/__towrite.c
@@ -17,7 +17,7 @@
 	return 0;
 }
 
-void __towrite_needs_stdio_exit()
+hidden void __towrite_needs_stdio_exit()
 {
 	__stdio_exit_needed();
 }