cmake HAS_VST2_SDK_PATH examples

Birch-san/juicysfplugin CMakeLists.txt :144

target_compile_definitions(JuicySFPlugin
    PUBLIC
        # JUCE_WEB_BROWSER and JUCE_USE_CURL would be on by default, but you might not need them.
        JUCE_WEB_BROWSER=0  # If you remove this, add `NEEDS_WEB_BROWSER TRUE` to the `juce_add_plugin` call
        JUCE_USE_CURL=0     # If you remove this, add `NEEDS_CURL TRUE` to the `juce_add_plugin` call
        # JUCE_CORE_INCLUDE_OBJC_HELPERS=1
        DONT_SET_USING_JUCE_NAMESPACE=1
        JUCE_VST3_CAN_REPLACE_VST2=${HAS_VST2_SDK_PATH})