fix more warnings

src/platform_util.cpp

@@ -39,6 +39,10 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #if TORRENT_USE_RLIMIT
 #include <sys/resource.h>
+
+// capture this here where warnings are disabled (the macro generates warnings)
+const rlim_t rlimit_as = RLIMIT_AS;
+const rlim_t rlim_infinity = RLIM_INFINITY;
 #endif
 
 #ifdef TORRENT_BSD
@@ -93,7 +97,7 @@ namespace libtorrent
 		if (ret > 0)
 		{
 			struct rlimit r;
-			if (getrlimit(RLIMIT_AS, &r) == 0 && r.rlim_cur != RLIM_INFINITY)
+			if (getrlimit(rlimit_as, &r) == 0 && r.rlim_cur != rlim_infinity)
 			{
 				if (ret > r.rlim_cur)
 					ret = r.rlim_cur;