Add linux-ppc (PPC32 BE) build support to micromamba

[hpckurt]

This PR adds build support for Big Endian PPC32.

As there's currently no conda distribution for PPC32, you have to manually compile and install the static libraries (which is why the target_link_libraries are different for PPC32).

Tested and verified working on the Nintendo Wii U.

[hpckurt]

I could be wrong, but I don't believe the workflow errors are related to my code.

I can build using -D CMAKE_BUILD_TYPE="Release" and it successfully builds. My full build command is:

cmake -B build/ -G Ninja -D CMAKE_INSTALL_PREFIX=/opt/mamba -D CMAKE_BUILD_TYPE="Release" -D BUILD_LIBMAMBA=ON -D BUILD_STATIC=ON -D BUILD_MICROMAMBA=ON -DCMAKE_C_FLAGS="-mcpu=espresso -latomic" -DCMAKE_CXX_FLAGS="-fdiagnostics-color=always -mcpu=espresso -latomic" -DCMAKE_STRIP=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-strip -DCMAKE_CXX_COMPILER=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-g++ -DCMAKE_C_COMPILER=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-gcc -DCMAKE_LINKER=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-ld -DCMAKE_READELF=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-readelf -DCMAKE_RANLIB=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-ranlib -DCMAKE_OBJDUMP=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-objdump -DCMAKE_OBJCOPY=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-objcopy -DCMAKE_NM=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-nm -DCMAKE_AR=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-ar -DCMAKE_C_COMPILER_AR=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-ar -DCMAKE_C_COMPILER_RANLIB=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-ranlib -DCMAKE_CXX_COMPILER_AR=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-ar -DCMAKE_CXX_COMPILER_RANLIB=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-ranlib -DCMAKE_ADDR2LINE=/root/toolchain/x-tools/powerpc-espresso-linux-gnu/bin/powerpc-espresso-linux-gnu-addr2line -Dfmt_DIR=/usr/local/include/fmt -Dspdlog_DIR=/usr/local/include/spdlog -Dtl-expected_DIR=/usr/local/include/tl -Dnlohmann_json_DIR=/usr/local/include/nlohmann -Dyaml-cpp_DIR=/usr/local/include/yaml-cpp -Dreproc_DIR=/usr/local/include/reproc -Dsimdjson_DIR=/usr/local/include  -Dreproc++_DIR=/usr/local/include/reproc++ -DZLIB_ROOT=/opt/zlib -DLibsolv_INCLUDE_DIR=/usr/local/include/solv -DMAMBA_WARNING_AS_ERROR=OFF -DPPC32=ON

You do have to disable MAMBA_WARNING_AS_ERROR for it to build correctly though.

The OS it was tested on is debian ppc, but it's also known to build on adelie linux. It also builds without -mcpu=espresso, but you need -mcpu=espresso for it to run on the Wii U with the SMP kernel.