gthr-posix.h [...] (__gthread_active_p): If __GLIBC__ is defined, refer to __pthread_key_create instead of pthread_cancel.

	* gthr-posix.h [neither FreeBSD nor Solaris] (__gthread_active_p):
	If __GLIBC__ is defined, refer to __pthread_key_create instead of
	pthread_cancel.

From-SVN: r188400