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[lib/c] Fix unbuffered output

It needs a special case in __putc, because the character
must be assigned before calling _flsbuf().

--- a/lib/c/__putc.c

+++ b/lib/c/__putc.c

@@ -60,10 +60,14 @@

 		*fp->lp++ = ch;

 		if (ch == '\n' && _flsbuf(fp))

 			return EOF;

-	} else {

+	} else if (fp->flags & _IOFBF) {

 		if (fp->wp == fp->rp && _flsbuf(fp))

 			return EOF;

 		*fp->wp++ = ch;

+	} else {

+		*fp->wp++ = ch;

+		if (_flsbuf(fp))

+			return EOF;

 	}

 done:

--- a/lib/c/stdio.c

+++ b/lib/c/stdio.c

@@ -26,6 +26,8 @@

 		.fd = 2,

 		.buf = stderr->unbuf,

 		.len = sizeof(stderr->unbuf),

-		.flags = _IOWRITE

+		.flags = _IOWRITE | _IONBF,

+		.rp = stderr->unbuf,

+		.wp = stderr->unbuf,

 	},

 };