Throughout Cygwin, use u_intN_t or uintN_t

Don't use u_char, u_short, u_int or u_long in Cygwin, unless it refers
to the Winsock types.  Use u_intN_t in BSD-based sources, unsigned char
where strings are concerned, uintN_t otherwise.  Also:

	* net.cc: Fix comment, we're not using u_long anymore.

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

winsup/cygwin/exceptions.cc

@@ -46,8 +46,8 @@ details. */
 #define CALL_HANDLER_RETRY_INNER 10
 
 PWCHAR debugger_command;
-extern u_char _sigbe;
-extern u_char _sigdelayed_end;
+extern uint8_t _sigbe;
+extern uint8_t _sigdelayed_end;
 
 static BOOL WINAPI ctrl_c_handler (DWORD);