S390: Fix sem.h conformance test failures.

  Hi,

on s390 the following tests are failing:
FAIL: conform/UNIX98/sys/sem.h/conform
FAIL: conform/XOPEN2K/sys/sem.h/conform
FAIL: conform/XOPEN2K8/sys/sem.h/conform
FAIL: conform/XPG3/sys/sem.h/conform
FAIL: conform/XPG4/sys/sem.h/conform

The test out files report:
...
   Testing for type of member sem_otime... FAIL
     Member "sem_otime" does not have the correct type.  Compiler message:
     -----------------------------------------------------------------------
     conform/UNIX98/sys/sem.h/scratch/sys-sem.h-test.c:3:1: error: 
unknown type name ‘time_t’
      extern time_t b;
      ^
     conform/UNIX98/sys/sem.h/scratch/sys-sem.h-test.c:4:33: error: 
conflicting types for ‘b’
      extern __typeof__ (a.sem_otime) b;
                                      ^
     conform/UNIX98/sys/sem.h/scratch/sys-sem.h-test.c:3:15: note: 
previous declaration of ‘b’ was here
      extern time_t b;
                    ^
     -----------------------------------------------------------------------
...
   Testing for type of member sem_ctime... FAIL
     Member "sem_ctime" does not have the correct type.  Compiler message:
     -----------------------------------------------------------------------
     conform/UNIX98/sys/sem.h/scratch/sys-sem.h-test.c:3:1: error: 
unknown type name ‘time_t’
      extern time_t b;
      ^
     conform/UNIX98/sys/sem.h/scratch/sys-sem.h-test.c:4:33: error: 
conflicting types for ‘b’
      extern __typeof__ (a.sem_ctime) b;
                                      ^
     conform/UNIX98/sys/sem.h/scratch/sys-sem.h-test.c:3:15: note: 
previous declaration of ‘b’ was here
      extern time_t b;
                    ^
     -----------------------------------------------------------------------
...
   Testing for type pid_t... FAIL
     Type "pid_t" not available.  Compiler message:
     -----------------------------------------------------------------------
     conform/UNIX98/sys/sem.h/scratch/sys-sem.h-test.c:2:1: error: 
unknown type name ‘pid_t’
      pid_t *a;
      ^
     -----------------------------------------------------------------------

   Testing for type time_t... FAIL
     Type "time_t" not available.  Compiler message:
     -----------------------------------------------------------------------
     conform/UNIX98/sys/sem.h/scratch/sys-sem.h-test.c:2:1: error: 
unknown type name ‘time_t’
      time_t *a;
      ^
     -----------------------------------------------------------------------


This patch changes the s390 specific sem.h and includes sys/types.h 
instead of bits/types.h. All other archs include sys/types.h, too.
Including bits/wordsize.h is obselete, because it is already inlcuded in 
sys/types.h -> bits/types.h.

The conformance tests are passing now on s390/s390x.

Ok for commit?

Bye
Stefan

---
2015-07-07  Stefan Liebler  <stli@linux.vnet.ibm.com>

	* sysdeps/unix/sysv/linux/s390/bits/sem.h:
	Include sys/types.h instead of bits/types.h.
	Remove inclusion of bits/wordsize.h.
  

On Tue, 2015-07-07 at 12:31 +0200, Stefan Liebler wrote:
> This patch changes the s390 specific sem.h and includes sys/types.h 
> instead of bits/types.h. All other archs include sys/types.h, too.
> Including bits/wordsize.h is obselete, because it is already inlcuded in 
> sys/types.h -> bits/types.h.

LGTM.