Add timeout detection to CVC3 and CVC4 drivers.

Hopefully, it should fix the nightly bench for CVC3 2.2.

drivers/cvc3_bare.drv

@@ -10,6 +10,7 @@ fail "Parse Error: \\(.*\\)" "\\1"
 valid "Valid\\."
 unknown "Unknown\\." ""
 outofmemory "Out of memory\\|std::bad_alloc\\|GNU MP: Cannot allocate memory"
+timeout "self-timeout"
 time "why3cpulimit time : %s s"
 
 (* À discuter *)

drivers/cvc4_bare.drv

@@ -14,9 +14,9 @@ filename "%f-%t-%g.smt2"
 valid "^unsat"
 unknown "^\\(unknown\\|sat\\|Fail\\)" ""
 outofmemory "(error \".*out of memory\")\\|Cannot allocate memory"
+timeout "interrupted by timeout"
 time "why3cpulimit time : %s s"
 
-
 (* À discuter *)
 transformation "inline_trivial"