runtime: only use CRLF on baremetal systems

We should only do this on baremetal systems, not on Linux, macOS, and
Windows. In fact, Windows will convert LF into CRLF in its putchar
function.

src/runtime/print.go

@@ -273,7 +273,9 @@ func printspace() {
 }
 
 func printnl() {
-	putchar('\r')
+	if baremetal {
+		putchar('\r')
+	}
 	putchar('\n')
 }