remove CMakelist modif

GTest/CMakeLists.txt

@@ -3,13 +3,6 @@ find_package(Threads REQUIRED)
 # Enable ExternalProject CMake module
 include(ExternalProject)
 
-INCLUDE(CheckCXXCompilerFlag)
-CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
-IF(COMPILER_SUPPORTS_CXX11)
-  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-ELSE()
-  MESSAGE(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
-ENDIF()
 # Download and install GoogleTest
 ExternalProject_Add(
     gtest