Add project files

breeze/cmake/toolchains/windows-x64-mingw64.cmake

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+# windows-x64-mingw64: MinGW-w64 GCC building for 64-bit Windows.
+#
+#   Windows host: x86_64-w64-mingw32-g++ from an MSYS2 MINGW64 shell (or any
+#                 MinGW-w64 on PATH).
+#   Linux host:   a cross build. breeze/scripts/setup.sh installs this for you on
+#                 apt (g++-mingw-w64-x86-64), dnf (mingw64-gcc-c++) or
+#                 pacman (mingw-w64-gcc, which also covers the 32-bit
+#                 preset below). If wine is installed it is registered as
+#                 the emulator, so ctest can run the result.
+#
+# See _common.cmake (pmn_mingw_toolchain) for the details and overrides.
+include("${CMAKE_CURRENT_LIST_DIR}/_common.cmake")
+
+pmn_toolchain_target("windows-x64-mingw64")
+pmn_mingw_toolchain(x64)