[build] _WIN32 shared dll build (autotools, cmake)

There are likely better and cleaner ways to do this; patches welcome.

_WIN32 symbol imports and exports

MS Visual Studio (_MSC_VER) does not appear to export global data
symbols even when exporting all functions.

Annotating any symbols with __declspec(dllexport) in any translation
unit appears to change default dll symbol implict export behavior.

Currently, src/Makefile.am and CMakeLists.txt take different approaches
(implib versus linking against executable which has exported symbols)

x-ref:
  (improved solutions might possibly be constructed using these docs)
  https://sourceware.org/binutils/docs/ld/WIN32.html
  https://cmake.org/cmake/help/latest/prop_tgt/WINDOWS_EXPORT_ALL_SYMBOLS.html
  https://stackoverflow.com/questions/225432/export-all-symbols-when-creating-a-dll

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