[klibc] stdio: don't force stdin and stdout to line buffered

Don't force stdin and stdout to be line buffered, instead let them be
line- or fully buffered depending on the I/O type.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/usr/klibc/stdio/fdopen.c b/usr/klibc/stdio/fdopen.c
index a921b59..51285ba 100644
--- a/usr/klibc/stdio/fdopen.c
+++ b/usr/klibc/stdio/fdopen.c
@@ -51,11 +51,7 @@
 void __init_stdio(void)
 {
 	stdin  = fdopen(0, NULL);
-	stdio_pvt(stdin)->bufmode = _IOLBF;
-
 	stdout = fdopen(1, NULL);
-	stdio_pvt(stdout)->bufmode = _IOLBF;
-
 	stderr = fdopen(2, NULL);
 	stdio_pvt(stderr)->bufmode = _IONBF;
 }