y2038: nptl: Convert pthread_mutex_{clock|timed}lock to support 64 bit

The pthread_mutex_clocklock and pthread_mutex_timedlock have been converted
to support 64 bit time.

This change uses:
- New __futex_clocklock_wait64 (instead of lll_timedwait)

from ./sysdeps/nptl/futex-helpers.c and

- New __futex_clocklock64 function (instead of lll_clocklock)
- New futex_lock_pi64

defined in sysdeps/nptl/futex-internal.h

The pthread_mutex_{clock|timed}lock only accepts absolute time.
Moreover, there is no need to check for NULL passed as *abstime pointer to the
syscalls as those calls have exported symbols marked with __nonull attribute
for abstime.

Some architectures - namely x86, powerpc and s390 - do support lock elision.
For those - adjustments have been made in arch specific elision-*.c files
to use __futex_clocklock64 instead of lll_clocklock.
The __lll_lock_elision (aliased to __lll_clocklock_elision in e.g.
sysdeps/unix/sysv/linux/s390/elision-timed.c) just uses, in this patch
provided, __futex_clocklock64.

For systems with __TIMESIZE != 64 && __WORDSIZE == 32:
- Conversions between 64 bit time to 32 bit are necessary
- Redirection to pthread_mutex_{clock|timed}lock will provide support for 64
bit time

Build tests:
./src/scripts/build-many-glibcs.py glibcs

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

sysdeps/unix/sysv/linux/powerpc/elision-timed.c

@@ -19,10 +19,11 @@
 #include <time.h>
 #include <elision-conf.h>
 #include "lowlevellock.h"
+#include "futex-internal.h"
 
 #define __lll_lock_elision __lll_clocklock_elision
-#define EXTRAARG clockid_t clockid, const struct timespec *t,
+#define EXTRAARG clockid_t clockid, const struct __timespec64 *t,
 #undef LLL_LOCK
-#define LLL_LOCK(a, b) lll_clocklock(a, clockid, t, b)
+#define LLL_LOCK(a, b) __futex_clocklock64 (&(a), clockid, t, b)
 
 #include "elision-lock.c"

sysdeps/unix/sysv/linux/powerpc/lowlevellock.h

@@ -24,7 +24,7 @@
 /* Transactional lock elision definitions.  */
 extern int __lll_clocklock_elision
   (int *futex, short *adapt_count,
-   clockid_t clockid, const struct timespec *timeout, int private)
+   clockid_t clockid, const struct __timespec64 *timeout, int private)
   attribute_hidden;
 
 #define lll_clocklock_elision(futex, adapt_count, clockid, timeout, private) \