Comment out unneeded function.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4064 d4fa192b-c00b-0410-8231-f00ffab90ce4

lib/libvarnishcompat/execinfo.c

@@ -132,6 +132,7 @@ backtrace_symbols(void *const *buffer, int size)
     return rval;
 }
 
+#if 0
 void
 backtrace_symbols_fd(void *const *buffer, int size, int fd)
 {
@@ -173,6 +174,7 @@ backtrace_symbols_fd(void *const *buffer, int size, int fd)
         write(fd, buf, len - 1);
     }
 }
+#endif
 
 void *
 getreturnaddr(int level)