Cygwin: remove warnings from testsuite build

- drop unused variable
- remove deprectated usage of std::pointer_to_unary_function.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/testsuite/cygrun.c

@@ -22,7 +22,6 @@ main (int argc, char **argv)
   PROCESS_INFORMATION pi;
   DWORD res;
   DWORD ec = 1;
-  char *p;
   DWORD timeout = 60 * 1000;
 
   if (argc < 2)

winsup/testsuite/winsup.api/cygload.cc

@@ -597,12 +597,9 @@ main (int argc, char *argv[])
     }
 
     // And signal handling:
-    std::pointer_to_unary_function < int , void > h1 (&hangup);
-    std::pointer_to_unary_function < int , void > h2 (&interrupt);
-    std::pointer_to_unary_function < int , void > h3 (&catch_signal);
-    cygwin.set_handler (SIGHUP, &h1);
-    cygwin.set_handler (SIGINT, &h2);
-    cygwin.set_handler (SIGUSR1, &h3);
+    cygwin.set_handler (SIGHUP, hangup);
+    cygwin.set_handler (SIGINT, interrupt);
+    cygwin.set_handler (SIGUSR1, catch_signal);
 
     // Make sure the signal handler thread has had time to start...
     Sleep (100);

winsup/testsuite/winsup.api/cygload.h

@@ -102,7 +102,7 @@ namespace cygwin
   public:
     // The constructor will automatically hook you up for receiving
     // cygwin signals.  Just specify a signal and pass in a signal_handler.
-    typedef std::pointer_to_unary_function<int,void> signal_handler;
+    typedef void signal_handler (int);
     signal_handler *set_handler (int signal, signal_handler *);
 
   private: