Update windows compilers

[h-vetinari]

Hey all

This feedstock is directly specifying vs2017_{{ target_platform }} as a dependency,

igraph-feedstock/recipe/meta.yaml

Lines 24 to 29 in c1c6077

	requirements:
	build:
	- libtool # [unix]
	- {{ compiler('c') }}
	- {{ compiler('cxx') }}
	- vs2017_{{ target_platform }} # [win]

but should just rely on the {{ compiler('c') }} function to provide the correct compilers on windows. In particular, conda-forge has moved on to vs2019 as the default compiler a while ago already.

If you think you need vs2017, please let us know why (generally vs2019 and vs2022 should be fully compatible). If it's really necessary, please use the dedicated mechanism in conda_build_config.yaml for that, i.e.

c_compiler:     # [win]
  - vs2017      # [win]
cxx_compiler:   # [win]
  - vs2017      # [win]

as opposed to specifying it in meta.yaml directly

[vtraag]

Re-opened because of need to re-render: #64 (comment)

[h-vetinari]

Thanks for the quick response!

You can see that it's already rerendered correctly if you look into the generated ci configuration:

igraph-feedstock/.ci_support/win_64_.yaml

Lines 1 to 2 in 89818fd

	c_compiler:
	- vs2019

[xylar]

Ah, great! That saves us some trouble!

[h-vetinari]

This is still used in the test requirements:

igraph-feedstock/recipe/meta.yaml

Line 59 in 89818fd

- vs2017_{{ target_platform }} # [win]