Hide unused symbols in unix libraries #256

Job	Run time
🍏 MacOS (universal, editor)	51s
🐧 Linux (x86_64, editor)	19s
🍏 MacOS (universal, template_release)	1m 22s
🕸 Web (wasm32, template_debug)	1m 27s
🐧 Linux (x86_64, template_release)	24s
🤖 Android (arm32, template_debug)	55s
🕸 Web (wasm32, template_release)	1m 24s
🤖 Android (arm32, template_release)	1m 0s
🏁 Windows (x86_64, editor)	2m 40s
🤖 Android (arm64, template_debug)	42s
🏁 Windows (x86_64, template_release)	2m 58s
🤖 Android (arm64, template_release)	42s
🤖 Android (x86_32, template_debug)	44s
🤖 Android (x86_32, template_release)	54s
🤖 Android (x86_64, template_debug)	36s
🤖 Android (x86_64, template_release)	31s
📦 Collect GDExtension binaries	6s
	17m 35s

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