Fixed compile error when FIXED_CONTROL_ENDPOINT_SIZE compile time option was disabled, and a USE_*_DESCRIPTORS compile time option was not enabled on the AVR8s.

Add C++ compatibility to some header files currently missing extern "C" linkage.

LUFA/ManPages/ChangeLog.txt

@@ -45,6 +45,9 @@
   *   - Large number of documentation and code comment corrections (thanks to Andrey from Microsin.ru)
   *   - Fixed possibility of the AVR's SPI interface being pulled out of master mode if the /SS pin is a input and pulled low (thanks
   *     to Andrey from Microsin.ru)
+  *   - Fixed compile error when FIXED_CONTROL_ENDPOINT_SIZE compile time option was disabled, and a USE_*_DESCRIPTORS compile time
+  *     option was not enabled on the AVR8s
+  *   - Fixed lack of C++ compatibility in some internal header files causing compile errors when using LUFA in C++ projects
   *  - Library Applications:
   *   - Fixed incorrect signature in the CDC and DFU class bootloaders for the ATMEGA8U2
   *   - Fixed KeyboardHost and KeyboardHostWithParser demos displaying incorrect values when numerical keys were pressed