Build

Use COMPILE_FLAGS for Windows VST3 module definitions #328

Job	Run time
Pluginval Build (Linux, ubuntu-latest, pluginval, ./pluginval, ubuntu:24.04)	3m 36s
Pluginval Build (macOS, macos-15, pluginval.app, pluginval.app/Contents/MacOS/pluginval)	2m 23s
Pluginval Build (Windows, windows-latest, pluginval.exe, ./pluginval.exe)	8m 0s
deploy	-1s
	13m 58s

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