RTEMS/Ada: Fix some POSIX types

gcc/ada
	* libgnarl/s-osinte__rtems.ads (pthread_cond_t): Use correct size and
	alignment.
	(pthread_mutex_t): Likewise.
	(pthread_rwlock_t): Likewise.

From-SVN: r255302

gcc/ada/ChangeLog

+2017-12-01  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	* libgnarl/s-osinte__rtems.ads (pthread_cond_t): Use correct size and
+	alignment.
+	(pthread_mutex_t): Likewise.
+	(pthread_rwlock_t): Likewise.
+
 2017-11-28  Jakub Jelinek  <jakub@redhat.com>
 
 	* gcc-interface/trans.c (Case_Statement_to_gnu): Build SWITCH_EXPR

gcc/ada/libgnarl/s-osinte__rtems.ads

@@ -659,11 +659,23 @@ private
 
    type pthread_t is new rtems_id;
 
-   type pthread_mutex_t is new rtems_id;
+   type pthread_mutex_t is record
+      Data : char_array (1 .. OS_Constants.PTHREAD_MUTEX_SIZE);
+   end record;
+   pragma Convention (C, pthread_mutex_t);
+   for pthread_mutex_t'Alignment use Interfaces.C.double'Alignment;
 
-   type pthread_rwlock_t is new rtems_id;
+   type pthread_rwlock_t is record
+      Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCK_SIZE);
+   end record;
+   pragma Convention (C, pthread_rwlock_t);
+   for pthread_rwlock_t'Alignment use Interfaces.C.double'Alignment;
 
-   type pthread_cond_t is new rtems_id;
+   type pthread_cond_t is record
+      Data : char_array (1 .. OS_Constants.PTHREAD_COND_SIZE);
+   end record;
+   pragma Convention (C, pthread_cond_t);
+   for pthread_cond_t'Alignment use Interfaces.C.double'Alignment;
 
    type pthread_key_t is new rtems_id;