cleaning up mingw cross-compiler Dockerfile

Author: ianbotsf

docker-images/mingw-x64/Dockerfile

@@ -1,32 +1,2 @@
-# FROM dockcross/windows-shared-x64:20250324-a3b42cd
 FROM dockcross/windows-static-x64:20250324-a3b42cd
 ENV DEFAULT_DOCKCROSS_IMAGE aws-crt-kotlin/mingw-x64:latest
-
-RUN curl -LJo konan-toolchain.tar.gz https://download.jetbrains.com/kotlin/native/msys2-mingw-w64-x86_64-2.tar.gz
-# Remove the cross compile root from the original image and put our own one based
-# on the K/N toolchain.
-#RUN mv /usr/src/mxe/usr/x86_64-w64-mingw32.static /tmp/original/ && \
-#    mkdir -p /usr/src/mxe/usr/x86_64-w64-mingw32 && \
-#    tar -xzf konan-toolchain.tar.gz -C /usr/src/mxe/usr/x86_64-w64-mingw32 --strip-components=1 && \
-#    rm konan-toolchain.tar.gz
-#
-#ENV MXE_PREFIX /usr/src/mxe/usr
-#ENV CROSS_TRIPLE x86_64-w64-mingw32
-#ENV CROSS_ROOT ${MXE_PREFIX}/${CROSS_TRIPLE}
-#RUN chmod 755 ${CROSS_ROOT}/bin/*.exe ${CROSS_ROOT}/${CROSS_TRIPLE}/bin/*.exe
-#ENV PATH ${PATH}:${CROSS_ROOT}/bin:${CROSS_ROOT}/${CROSS_TRIPLE}/bin
-#
-#ENV AS=${CROSS_TRIPLE}.static-as \
-#    AR=${CROSS_TRIPLE}.static-ar \
-#    CC=${CROSS_TRIPLE}.static-gcc \
-#    CPP=${CROSS_TRIPLE}.static-cpp \
-#    CXX=${CROSS_TRIPLE}.static-g++ \
-#    LD=${CROSS_TRIPLE}.static-ld \
-#    FC=${CROSS_TRIPLE}.static-gfortran \
-#    STRIP=${CROSS_TRIPLE}.static-strip \
-#    OBJCOPY=${CROSS_TRIPLE}.static-objcopy \
-#    CFLAGS="-I ${CROSS_ROOT}/include/ -I ${CROSS_ROOT}/${CROSS_TRIPLE}/include/ -L ${CROSS_ROOT}/lib/ -L ${CROSS_ROOT}/${CROSS_TRIPLE}/lib/" \
-#    LDFLAGS="-L ${CROSS_ROOT}/lib/ -L ${CROSS_ROOT}/${CROSS_TRIPLE}/lib"
-#
-#COPY docker-images/mingw-x64/Toolchain.cmake ${CROSS_ROOT}/
-#ENV CMAKE_TOOLCHAIN_FILE ${CROSS_ROOT}/Toolchain.cmake