posix: add _POSIX_SEM_NSEMS_MAX.

* have _SC__SEM_NSEMS_MAX return _POSIX_SEM_NSEMS_MAX, a per team limit
instead of the global limit.

headers/posix/limits.h

@@ -72,6 +72,7 @@
 #define _POSIX_CLOCKRES_MIN		20000000
 #define _POSIX_TIMER_MAX		32
 #define _POSIX_DELAYTIMER_MAX	32
+#define _POSIX_SEM_NSEMS_MAX	(128)
 
 #define _POSIX2_LINE_MAX		(2048)
 

headers/private/system/posix/realtime_sem_defs.h

@@ -6,10 +6,10 @@
 #define SYSTEM_REALTIME_SEM_H
 
 
-#include <unistd.h>
+#include <limits.h>
 
 
-#define MAX_POSIX_SEMS_PER_TEAM	128
+#define MAX_POSIX_SEMS_PER_TEAM	_POSIX_SEM_NSEMS_MAX
 #define MAX_POSIX_SEMS			1024
 #define MAX_POSIX_SEM_VALUE		_POSIX_SEM_VALUE_MAX
 

src/system/libroot/posix/unistd/conf.cpp

@@ -90,7 +90,7 @@ __sysconf(int name)
 		case _SC_PAGE_SIZE:
 			return B_PAGE_SIZE;
 		case _SC_SEM_NSEMS_MAX:
-			return MAX_POSIX_SEMS;
+			return _POSIX_SEM_NSEMS_MAX;
 		case _SC_SEM_VALUE_MAX:
 			return _POSIX_SEM_VALUE_MAX;
 		case _SC_SEMAPHORES: