cmake CHECK_CURL_HAS_H2 examples

aws/aws-sdk-cpp src/aws-cpp-sdk-core/CMakeLists.txt :166 

check_c_source_compiles("${CHECK_CURL_HAS_H2}" CURL_HAS_H2)

aws/aws-sdk-cpp src/aws-cpp-sdk-core/CMakeLists.txt :169 

check_c_source_runs("${CHECK_CURL_HAS_H2}" CURL_HAS_H2)