Add project files

cmake/mingw-w64-x86_64.cmake

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+# Cross-compiling for 64-bit Windows from Linux with MinGW-w64:
+#
+#   sudo apt install g++-mingw-w64-x86-64-posix
+#   cmake -B build-win -DCMAKE_TOOLCHAIN_FILE=cmake/mingw-w64-x86_64.cmake -DANTLRLAB_DOWNLOAD_JAR=ON
+#   cmake --build build-win
+#
+# The "posix" thread model is required: the "win32" one has no std::thread.
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+set(CMAKE_C_COMPILER x86_64-w64-mingw32-gcc-posix)
+set(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++-posix)
+set(CMAKE_RC_COMPILER x86_64-w64-mingw32-windres)
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)