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Part 1: the new file FL/win32_target.h simplifies setting minimal Windows version macros to support building with minimal Windows version symbols, such as for Windows 2000 or Windows 8, rather than hardcoding weird C/C++ macro code to define the symbols. Part 2: apply this everywhere where WINVER and _WIN32_WINNT needed to be set manually. Part 3: fix pen support builds on Windows by setting the correct minimal Windows version in the concerned source files. Part 4: fix CMake compilation test for pen support: use a symbol that's really used in the sources.