Avoid calling GetModemStatusBits on Android. Should fix #1

cts.go

@@ -0,0 +1,14 @@
+//go:build !android
+
+package main
+
+import "github.com/albenik/go-serial/v2"
+
+// cts returns the clear-to-send status of a device. On Android it will return true as GetModemStatusBits() fails there.
+func cts(p *serial.Port) (bool, error) {
+	r, err := p.GetModemStatusBits()
+	if err != nil {
+		return false, err
+	}
+	return r.CTS, nil
+}