Certain windows build environments (see
https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=1234387&view=results
for an example) fail unless the echo command is properly quoted. This
seems to be due to how Make handles various commands on non-posix
systems; without the quotes it directly tries to run
```
echo foo bar
```
inside cmd.exe, which fails as echo is not a valid command in that context.
Co-authored-by: Anders Harrisson <anders.harrisson@ess.eu>
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