(random, srandom) [_WIN32]: Provide random and srandom

POSIX equivalents instead of using the WIN32 rand/srand functions.
The files were derived from GNU libc source.

(empth_threadMain) [_WIN32]: Remove the srandom() as the
POSIX equivalent are not thread specific as the WIN32 functions were.

src/lib/empthread/ntthread.c

@@ -326,8 +326,6 @@ loc_Exit_Handler(DWORD fdwCtrlType)
 static void
 empth_threadMain(void *pvData)
 {
-    time_t now;
-
     empth_t *pThread = pvData;
 
     /* Out of here... */
@@ -343,13 +341,6 @@ empth_threadMain(void *pvData)
     /* Signal that the thread has started. */
     SetEvent(hThreadStartEvent);
 
-    /*
-     * seed the rand() function
-     * In WIN32, each thread has seed
-     */
-    time(&now);
-    srandom(now ^ (unsigned)pThread);
-
     /* Switch to this thread context */
     loc_RunThisThread(NULL);