changes to support eclipse compat

support of Android assets as /assets files.

C/threads.c

@@ -90,6 +90,12 @@ Yap_ThreadID( void )
   return -1;
 }
 
+int
+Yap_NOfThreads(void) {
+  // GLOBAL_ThreadHandlesLock is held
+  return GLOBAL_NOfThreads;
+}
+
 static int
 allocate_new_tid(void)
 {
@@ -1090,6 +1096,17 @@ void Yap_InitThreadPreds(void)
 
 #else
 
+int
+Yap_NOfThreads(void) {
+  // GLOBAL_ThreadHandlesLock is held
+#ifdef YAPOR
+  return 2;
+#else
+  return 1;
+#endif
+}
+
+
 static Int 
 p_no_threads(void)
 {				/* '$thread_signal'(+P)	 */