Keep cmake_minimum_required calls in sync with current version

Update cmake_minimum_required calls in CMakeLists.txt in Modules and in
CMakeLists.txt generated by other modules, so that they are always in
sync with current CMake version.

Modules/CheckLanguage.cmake

@@ -47,7 +47,7 @@ macro(check_language lang)
     message(STATUS ${_desc})
     file(REMOVE_RECURSE ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang})
     file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}/CMakeLists.txt"
-      "cmake_minimum_required(VERSION 2.8)
+      "cmake_minimum_required(VERSION ${CMAKE_VERSION})
 project(Check${lang} ${lang})
 file(WRITE \"\${CMAKE_CURRENT_BINARY_DIR}/result.cmake\"
   \"set(CMAKE_${lang}_COMPILER \\\"\${CMAKE_${lang}_COMPILER}\\\")\\n\"

Modules/FindSDL_sound.cmake

@@ -183,7 +183,7 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
    # in the SDL_LIBRARY string after the "-framework".
    # But if I quote the stuff in INCLUDE_DIRECTORIES, it doesn't work.
    file(WRITE ${PROJECT_BINARY_DIR}/CMakeTmp/CMakeLists.txt
-     "cmake_minimum_required(VERSION 2.8)
+     "cmake_minimum_required(VERSION ${CMAKE_VERSION})
         project(DetermineSoundLibs)
         include_directories(${SDL_INCLUDE_DIR} ${SDL_SOUND_INCLUDE_DIR})
         add_executable(DetermineSoundLibs DetermineSoundLibs.c)

Modules/FortranCInterface/CMakeLists.txt

@@ -9,7 +9,7 @@
 # See the License for more information.
 #=============================================================================
 
-cmake_minimum_required(VERSION 2.6.3)
+cmake_minimum_required(VERSION ${CMAKE_VERSION})
 project(FortranCInterface C Fortran)
 include(${FortranCInterface_BINARY_DIR}/Input.cmake OPTIONAL)
 

Modules/FortranCInterface/Verify/CMakeLists.txt

@@ -9,7 +9,7 @@
 # See the License for more information.
 #=============================================================================
 
-cmake_minimum_required(VERSION 2.7)
+cmake_minimum_required(VERSION ${CMAKE_VERSION})
 project(VerifyFortranC C Fortran)
 
 option(VERIFY_CXX "Whether to verify C++ and Fortran" OFF)

Modules/IntelVSImplicitPath/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.8)
+cmake_minimum_required(VERSION ${CMAKE_VERSION})
 project(IntelFortranImplicit Fortran)
 add_custom_command(
   OUTPUT output.cmake