EZ4Stephen

-Intended to make building pbd with MSVC more viable while sidelining some of the ardourext includes when building by other means with MSVC. debug.cc and pthread_utils.h also need changes, (to...

Update abstract_ui.h

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All platforms use pthread_cmp.

Removed a macro for MSVC, simplified an #if ... else

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Simplified #if defined(COMPILER_MINGW) && defined(PTW32_VERSION) ... #else... . This was responsible for errors when compiling libs/ardour/midi_ui.cc. Removed DECLARE_DEFAULT_COMPARISONS(ptw32_handle_t) which was only for MSVC. Also adjusted ardourext/misc.h to reflect these changes.