Add PTHREAD_MUTEX_NORMAL_INT

Carlos asked for PTHREAD_MUTEX_NORMAL_INT to be added
to make some of the internal macros be easier to understand.
It is always identical to DEFAULT, as NORMAL only makes
a difference for settype.

2013-06-24  Andi Kleen  <ak@linux.intel.com>

	* pthreadP.h (PTHREAD_MUTEX_NORMAL_INT): Add and use
	for PTHREAD_MUTEX_PP_{PI,NORMAL}_NP .