Fix the 'ct' target to work on Windows with MSYS

src/rebar_ct.erl

@@ -102,7 +102,7 @@ clear_log(RawLog) ->
 %% log results
 check_log(RawLog) ->
     {ok, Msg} =
-        rebar_utils:sh("egrep -e 'TEST COMPLETE' -e '{error,make_failed}' "
+        rebar_utils:sh("grep -e 'TEST COMPLETE' -e '{error,make_failed}' "
                        ++ RawLog, [{use_stdout, false}]),
     MakeFailed = string:str(Msg, "{error,make_failed}") =/= 0,
     RunFailed = string:str(Msg, ", 0 failed") =:= 0,