Removes unused variable

--- ./src/hammerhead.cc.orig	2008-05-24 12:12:34 +0400
+++ ./src/hammerhead.cc	2008-05-24 12:13:18 +0400
@@ -455,7 +455,7 @@
 #ifdef USE_PTHREAD
     // create the threads
     pthread_attr_t threadattrs;
-    size_t ss = 65536;                        /* 16k? */
+//    size_t ss = 65536;                        /* 16k? */
 #endif
     list<long>::iterator altifit;
     list<HammerTarget>::iterator targetit;