Use generic pthread support on hppa.

        [BZ #21016]
        * sysdeps/hppa/nptl/bits/pthreadtypes.h: Update pthread_cond_t typedef.
        * sysdeps/unix/sysv/linux/hppa/pthread.h: Include
        bits/types/struct_timespec.h.
        (PTHREAD_MUTEX_INITIALIZER): Revise define.
        (PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP): Likewise.
        (PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP): Likewise.
        (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP): Likewise.
        (PTHREAD_RWLOCK_INITIALIZER): Likewise.
        (PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP): Likewise.
        (PTHREAD_COND_INITIALIZER): Likewise.
        Remove old definitions.
        * sysdeps/unix/sysv/linux/hppa/internaltypes.h: Delete.
        * sysdeps/unix/sysv/linux/hppa/pthread_cond_broadcast.c: Delete.
        * sysdeps/unix/sysv/linux/hppa/pthread_cond_destroy.c: Delete.
        * sysdeps/unix/sysv/linux/hppa/pthread_cond_init.c: Delete.
        * sysdeps/unix/sysv/linux/hppa/pthread_cond_signal.c: Delete.
        * sysdeps/unix/sysv/linux/hppa/pthread_cond_wait.c: Delete.