Update NSS to 3.21 RTM and NSPR to 4.11 RTM

nss/lib/util/nssrwlk.c

Index: nss/lib/util/nssrwlk.c
diff --git a/nss/lib/util/nssrwlk.c b/nss/lib/util/nssrwlk.c
index 65fceda2e600058ec364cad609ba1752850dc6a3..fbbfbd6ee56dbf21380f3ff51c60e5270da9bd21 100644
--- a/nss/lib/util/nssrwlk.c
+++ b/nss/lib/util/nssrwlk.c
@@ -91,7 +91,7 @@ NSSRWLock_New(PRUint32 lock_rank, const char *lock_name)
 	goto loser;
     }
     if (lock_name != NULL) {
-        rwlock->rw_name = (char*) PR_Malloc(strlen(lock_name) + 1);
+        rwlock->rw_name = (char*) PR_Malloc((PRUint32)strlen(lock_name) + 1);
         if (rwlock->rw_name == NULL) {
 	    goto loser;
         }