cmake HAVE_H2_CLIENT examples

aws/aws-sdk-cpp cmake/external_dependencies.cmake :107 

add_definitions("-DAWS_SDK_USE_CRT_HTTP -DHAVE_H2_CLIENT")

aws/aws-sdk-cpp tests/aws-cpp-sdk-transcribestreaming-integ-tests/CMakeLists.txt :25 

target_compile_definitions(${PROJECT_NAME} PRIVATE "HAVE_H2_CLIENT")