Update NSPR to 4.12 and NSS to 3.23 on iOS

nspr/pr/src/misc/prtrace.c

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 /*
 ** prtrace.c -- NSPR Trace Instrumentation
 **
 ** Implement the API defined in prtrace.h
 **
@@ skipping 639 matching lines @@
     /* Self initialize, if necessary */
     if ( traceLock == NULL )
         _PR_InitializeTrace();
 
     PR_LOG( lm, PR_LOG_DEBUG,
         ("PR_RecordTraceEntries: begins"));
 
     logLostData = 0; /* reset at entry */
     logState = LogReset;
 
-#ifdef XP_UNIX
-    if ((getuid() != geteuid()) || (getgid() != getegid())) {
-        return NULL;
-    }
-#endif /* XP_UNIX */
-
     /* Get the filename for the logfile from the environment */
-    logFileName = PR_GetEnv( "NSPR_TRACE_LOG" );
+    logFileName = PR_GetEnvSecure( "NSPR_TRACE_LOG" );
     if ( logFileName == NULL )
     {
         PR_LOG( lm, PR_LOG_ERROR,
             ("RecordTraceEntries: Environment variable not defined. Exiting"));
         return NULL;
     }
     
     /* Open the logfile */
     logFile = PR_Open( logFileName, PR_WRONLY | PR_CREATE_FILE, 0666 );
     if ( logFile == NULL )
@@ skipping 201 matching lines @@
 
     *found = copied;
     rc = ( fetchLostData == PR_TRUE )? 1 : 0;
     fetchLostData = PR_FALSE;
 
     PR_Unlock( traceLock );
     return rc;
 } /* end PR_GetTraceEntries() */
 
 /* end prtrace.c */