Change USBSerial.h constructor to allow to label the stream for, eg., redirecting stdin/out/err to a USBSerial object. Will not break existing default use as tested with mbed-os 5.11.5

Dependents:   max32630fthr_stdout2usb_mbed_v5-11-5 firmware_framework1

Revision:
69:dad310740b28
Parent:
25:7c72828865f3
--- a/USBSerial/USBCDC.h	Tue Jun 13 22:42:27 2017 +0000
+++ b/USBSerial/USBCDC.h	Tue Sep 11 15:17:01 2018 +0300
@@ -38,6 +38,8 @@
     * @param connect_blocking define if the connection must be blocked if USB not plugged in
     */
     USBCDC(uint16_t vendor_id, uint16_t product_id, uint16_t product_release, bool connect_blocking);
+	
+	volatile bool terminal_connected;
 
 protected:
 
@@ -116,7 +118,6 @@
     virtual bool USBCallback_request();
     virtual void USBCallback_requestCompleted(uint8_t *buf, uint32_t length);
     virtual bool USBCallback_setConfiguration(uint8_t configuration);
-    volatile bool terminal_connected;
 
 };