macOS

make the dll_copy generated file a PRIVATE target_source #467

Job	Run time
build (macos-latest, Debug, default)	2m 18s
build (macos-latest, Debug, ref)	2m 32s
build (macos-latest, Debug, shared)	2m 8s
build (macos-latest, Debug, no_fbx)	1m 5s
build (macos-latest, Release, default)	1m 24s
build (macos-latest, Release, ref)	1m 28s
build (macos-latest, Release, shared)	1m 34s
build (macos-latest, Release, no_fbx)	1m 9s
build (macos-14, Debug, default)	2m 41s
build (macos-14, Debug, ref)	2m 10s
build (macos-14, Debug, shared)	2m 5s
build (macos-14, Debug, no_fbx)	3m 10s
build (macos-14, Release, default)	1m 30s
build (macos-14, Release, ref)	1m 48s
build (macos-14, Release, shared)	1m 25s
build (macos-14, Release, no_fbx)	1m 37s
	30m 4s

Provide feedback