Add HERB_EXPORTED_FUNCTION macro for symbol visibility control#933
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Follow Prism's pattern for controlling symbol visibility when building shared libraries. The public API in
herb.h/herb.cis marked withHERB_EXPORTED_FUNCTION, which exports symbols whenHERB_EXPORT_SYMBOLSis defined.For the Ruby extension, only
Init_herbis exported, all other symbols (including prism'spm_*functions) remain hidden, to prevent future symbol conflicts with other libraries available on the system.Follow up on #906