Add pthread_mutexattr_get/set_protocol and non-standard sem_get/set_protocol.  These may use to enable or disable priority inheritance on a single semaphore.

Review of last PR: Fix return value (ERROR is not a value return value in this context).  Fix some spacing.

To write the last page

Xtensa: Adapt co-processor state save/restore functions so that they are call-able from C with Windows ABI.

Xtensa: Remove co-processor ownership array.  I think that this is not needed (but I might be wrong).

STM32F7:otgdev fixed typo