Missing packages on Conda Forge vs defaults on Windows

Conda forge does not rely on `defaults` on Unix, but there are some ties on Windows. On this notebook I try to quantify those differences. After the `msys2` rebuild these are way less! I can rerun this as needed or maybe it's better if the notebook is part of some official repo here. Please let me know which repo that'd be if you're interested:

https://colab.research.google.com/drive/1uladCMIOXgTU8MWl22JEAG7Qits9J34w?usp=sharing

## List as of 2020.12.18

Defaults contains 162 packages not in Conda Forge

- [ ] _anaconda_depends
- [ ] _ipyw_jlab_nb_ext_conf
- [x] _libgcc_mutex - unnecessary
- [ ] _low_priority
- [ ] _mutex_mxnet
- [ ] _py-xgboost-mutex
- [x] _pytorch_select - unnecessary
- [ ] _tflow_1100_select
- [ ] _tflow_190_select
- [ ] _tflow_select
- [ ] aiopg
- [ ] anaconda
- [ ] anaconda-clean
- [ ] anaconda-doc
- [ ] anaconda-docs
- [ ] anaconda-navigator
- [ ] anaconda-oss-docs
- [ ] ant
- [ ] aredis
- [ ] autoconf-archive
- [ ] bandersnatch
- [ ] bottlechest
- [ ] bsdiff4
- [ ] btrees
- [ ] casuarius
- [ ] ccache
- [ ] chameleon
- [ ] characteristic
- [ ] cheetah
- [ ] chromedriver-binary
- [x] cmake-binary - unnecessary
- [ ] cmake_setuptools
- [ ] colander
- [ ] conda-repo-cli
- [ ] conda-token
- [ ] console_shortcut
- [ ] continuum-docs
- [ ] cornice
- [ ] cryptacular
- [ ] cryptominisat
- [ ] cubes
- [ ] cupy
- [ ] cvxcanon
- [ ] cyrus-sasl
- [ ] essential_generators
- [ ] expressions
- [ ] faulthandler
- [ ] flask-json
- [ ] fonts-anaconda
- [ ] freetds
- [ ] fuel
- [ ] functools_lru_cache
- [ ] gdata
- [ ] get_terminal_size
- [x] go_linux-32 - unnecessary
- [x] go_linux-ppc64le - unnecessary
- [x] go_win-32 - unnecessary
- [ ] grako
- [ ] h2o
- [ ] icc_rt
- [ ] intel-fortran_win-32
- [ ] intel-fortran_win-64
- [ ] jq
- [ ] jupyter_dashboards_bundlers
- [ ] keras-base
- [ ] keras-gpu
- [ ] libboost
- [ ] libcryptominisat
- [ ] libmklml
- [ ] libmxnet
- [ ] libprotobuf-static
- [ ] libuv
- [ ] libxgboost
- [ ] lmdb
- [ ] lz4-c-static
- [ ] mdp
- [ ] mkl-dnn
- [ ] mklml
- [ ] mtq
- [ ] mxnet
- [ ] mxnet-gpu
- [ ] mxnet-gpu_mkl
- [ ] mxnet-mkl
- [ ] mysql-python
- [ ] mysqlclient
- [ ] navigator-updater
- [ ] neon
- [ ] numpy-base
- [ ] numpy-devel
- [ ] orc
- [ ] pandasql
- [ ] pbkdf2
- [ ] persistent
- [ ] picklable-itertools
- [ ] pivottablejs
- [ ] pivottablejs-airgap
- [ ] portpicker
- [ ] powershell_shortcut
- [ ] py-boost
- [ ] py-mxnet
- [ ] py-xgboost
- [ ] py-xgboost-cpu
- [ ] pyaudio
- [ ] pycryptosat
- [ ] pyjks
- [ ] pymc
- [ ] pymssql
- [ ] pyopengl-accelerate
- [ ] pyperformance
- [ ] pyramid_debugtoolbar
- [ ] pyramid_jinja2
- [ ] pyramid_mako
- [ ] pyramid_tm
- [ ] python-leveldb
- [ ] python-ntlm
- [ ] python-regr-testsuite
- [ ] python3-saml
- [ ] pytorch
- [ ] pywget
- [ ] qcachegrind
- [ ] r-xgboost
- [ ] r-xgboost-cpu
- [ ] redis
- [ ] rust-gnu
- [ ] sas7bdat
- [ ] sasl
- [ ] serf
- [ ] setuptools-scm-git-archive
- [ ] sockjs-tornado
- [ ] sphinxcontrib
- [ ] spyder_parso_requirement
- [x] stripe
- [ ] svn
- [ ] tabpy-client
- [ ] tabpy-server
- [ ] tensorflow-datasets
- [ ] tensorflow-eigen
- [ ] tensorflow-gpu
- [ ] tensorflow-gpu-base
- [ ] tensorflow-metadata
- [ ] tensorflow-mkl
- [ ] teradata
- [ ] testscenarios
- [ ] the_silver_searcher
- [ ] toolchain
- [ ] tornado-json
- [x] vs2008_win-32 - unnecessary
- [x] vs2008_win-64 - unnecessary
- [x] vs2013_runtime - unnecessary
- [x] vs2015_win-32 - unnecessary
- [x] vs2015_win-64 - unnecessary
- [x] vs2017_win-32 - unnecessary
- [x] vs2019_win-32
- [x] vs2019_win-64
- [ ] vswhere
- [ ] word2vec
- [ ] workerpool
- [ ] x507
- [ ] xmlrpc2
- [ ] zope
- [ ] zope.component
- [ ] zope.sqlalchemy

Defaults-MSYS contains 7 packages not in Conda Forge

- [ ] m2w64-diffutils
- [ ] m2w64-dsdp
- [ ] m2w64-glpk
- [ ] m2w64-metis
- [ ] m2w64-openblas
- [ ] m2w64-suitesparse
- [ ] m2w64-udunits2

> The notebook also contains info about the R packages, but those are way too many now:
>
> Defaults-R contains **5261** packages not in Conda Forge

cc @isuruf