Makefile: add -rdynamic on macOS to fix plugins with LTO #4680
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Prior to this change, some symbols would be missing from the yosys executable if built on macOS with LTO. This would break plugins on dlopen. By adding
-rdynamicto the linker flags, we can export all symbols even if they're unused due to LTO-enabled inlining or otherwise. You can check the exported symbols by building yosys with LTO on macOS and runningobjdump --macho --exports-trie yosys.