Allow manually defining symbol visibility in static builds #313
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I have a few build pipelines where I statically link utf8proc into a binary or other shared libs, but still need the symbols to be exported (e.g., plugins).
Because the CMake build system unconditionally defines UTF8PROC_STATIC, and there is no ifndef guard around UTF8PROC_DLLEXPORT, manually defining it with a flag is insufficient.
This PR just adds a small ifndef guard around the code block to allow manually defining
-DUTF8PROC_DLLEXPORT.