Cygwin: Avoid legacy warnings in RunCMake.CMP004[1235] tests

Set the minimum required version of CMake high enough to avoid the
warning for CMAKE_LEGACY_CYGWIN_WIN32.  The warning appears on stderr
and breaks the expected output matching.

Tests/RunCMake/CMP0041/CMakeLists.txt

-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 2.8.4)
 project(${RunCMake_TEST} CXX)
 include(${RunCMake_TEST}.cmake NO_POLICY_SCOPE)

Tests/RunCMake/CMP0042/CMakeLists.txt

-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 2.8.4)
 project(${RunCMake_TEST} CXX)
 include(${RunCMake_TEST}.cmake NO_POLICY_SCOPE)

Tests/RunCMake/CMP0043/CMakeLists.txt

-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 2.8.4)
 project(${RunCMake_TEST} CXX)
 include(${RunCMake_TEST}.cmake NO_POLICY_SCOPE)
 

Tests/RunCMake/CMP0045/CMakeLists.txt

-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 2.8.4)
 project(${RunCMake_TEST} CXX)
 include(${RunCMake_TEST}.cmake NO_POLICY_SCOPE)