Timeline for dropping vs2017

[h-vetinari]

We bumped the default windows compilers across conda-forge to vs2019 over a year ago (conda-forge/conda-forge-pinning-feedstock#3167), and usage of the previous vs2017 toolchain has dwindled.

Based on the following searches (in conda_build_config.yaml resp. meta.yaml), the only remaining feedstocks using vs2017 are as follows (I'm noting in brackets where the pin is set):

• [meta] Update windows compilers ace-feedstock#54 (pinned from feedstock creation 3 years ago)
• [CBC] Retry using VS2019 cupy-feedstock#250
• [CBC] Retry using VS2019 or newer cudasirecon-feedstock#28 (pin added only in June 2023)
• [CBC] Update windows compilers ensmallen-feedstock#43 (pins set ~4 years ago)
• [meta] Update windows compilers example-robot-data-feedstock#44 (pinned from feedstock creation 3 years ago)
• [CBC] Retry using VS2019 or newer fltk-feedstock#25 (pin added only in July 2023)
• [meta] Update windows compilers igraph-feedstock#65 (pins set ~4 years ago)
• [meta] https://github.com/conda-forge/libignition-physics-feedstock (false positive, appears in patch name)
• [meta] Update windows compilers louvain-feedstock#30 (pins set 3 years ago)
• [meta] Update windows compilers lua-feedstock#50 (pins set 4 years ago)
• [meta] Update windows compilers panda3d-feedstock#45 (pins set 3 years ago)
• [meta] Update windows compilers proxsuite-feedstock#53
• [meta] Update windows compilers pycppad-feedstock#19 (pins set 2 years ago)
• [meta] Update windows compilers pyinterp-feedstock#97 (pinned from feedstock creation 4 years ago)
• [meta] Update windows compilers sdl_image-feedstock#9 (feedstock for old version; sdl2_image uses regular setup)
• [CBC] Update windows compilers sox-feedstock#31 (pins set 2 years ago)
• [CBC] Retry using VS2019 or newer vigra-feedstock#128

In particular, everything that added pins on vs2017 before August 2022 was "just" selecting the default compilers.

Comatose / dead feedstocks

• [meta] https://github.com/conda-forge/azure-iot-sdk-c-feedstock
• [meta] https://github.com/conda-forge/azure-uamqp-c-feedstock
• [meta] https://github.com/conda-forge/azure-uhttp-c-feedstock
• [meta] https://github.com/conda-forge/azure-umqtt-c-feedstock
• [meta] https://github.com/conda-forge/libxfoil-feedstock
• [meta] https://github.com/conda-forge/oclgrind-feedstock
• [meta] https://github.com/conda-forge/parson-feedstock
• [meta] https://github.com/conda-forge/pytide-feedstock
• [CBC] https://github.com/conda-forge/sciplot-feedstock
• [meta] https://github.com/conda-forge/soem-feedstock

[h-vetinari]

Apparently MSFT removed the vc141 components (see #78), so I think this might have been decided for us.