cmake QT_HAVE_EMSCRIPTEN_ASYNCIFY examples

qt/qtbase cmake/QtWasmHelpers.cmake :84 

target_compile_definitions("${wasmTarget}" INTERFACE QT_HAVE_EMSCRIPTEN_ASYNCIFY)

qt/qtbase cmake/QtWasmHelpers.cmake :90 

target_compile_definitions("${wasmTarget}" INTERFACE QT_HAVE_EMSCRIPTEN_ASYNCIFY)