Allow serial strings to be generated on the older AVR8 devices which do not explicitly state they contain unique values in the datasheet, as this appears to be implemented in hardware.

LUFA/DoxygenPages/ChangeLog.txt

@@ -40,6 +40,8 @@
   *   - Updated the AVRISP-MKII Clone programmer project to be compatible with the latest version of AVR Studio (version 5.1)
   *   - Changed the AVRISP-MKII Clone programmer project to report a fixed 3.3V VTARGET voltage on USB AVRs lacking an ADC instead of 5V to prevent
   *     warnings in AVR Studio 5.1 when programming XMEGA devices
+  *   - Allow serial strings to be generated on the older AVR8 devices which do not explicitly state they contain unique values in the datasheet,
+  *     as this appears to be implemented in hardware
   *
   *  <b>Fixed:</b>
   *  - Core:

LUFA/Drivers/USB/Core/AVR8/Device_AVR8.h

@@ -101,8 +101,8 @@
 			//@}
 
 			#if (!defined(NO_INTERNAL_SERIAL) && \
-			     (defined(USB_SERIES_7_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_4_AVR) || \
+			     (defined(USB_SERIES_7_AVR) || defined(USB_SERIES_6_AVR) || \
-			      (defined(USB_SERIES_2_AVR) && (!defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__))) || \
+			      defined(USB_SERIES_4_AVR) || defined(USB_SERIES_2_AVR) || \
 				  defined(__DOXYGEN__)))
 				/** String descriptor index for the device's unique serial number string descriptor within the device.
 				 *  This unique serial number is used by the host to associate resources to the device (such as drivers or COM port