* dcrt0.cc (__argc_safe): New variable.

(dll_crt0_1): Store argc in __argc_safe, which will theoretically remain
untouched by the user.
* fhandler_console.cc (fhandler_console::read): Silence some compiler warnings.
* fhandler_raw.cc (fhandler_dev_raw::raw_read): Ditto.
* pinfo.cc (_pinfo::commune_recv): Carefully bound argv scan and check for
potentially bad pointers since user could have set argv cell to anythinw.
* cygheap.h (CYGHEAPSIZE): Bump up size.

winsup/cygwin/cygheap.h

@@ -259,7 +259,7 @@ struct init_cygheap
   struct sigaction *sigs;
 };
 
-#define CYGHEAPSIZE (sizeof (init_cygheap) + (16000 * sizeof (fhandler_union)) + (5 * 65536))
+#define CYGHEAPSIZE (sizeof (init_cygheap) + (20000 * sizeof (fhandler_union)) + (5 * 65536))
 
 extern init_cygheap *cygheap;
 extern void *cygheap_max;