add libint2

[loriab]

• static libs: Linux and Mac are properly shipping only the dynamic libraries. Windows is only building the static library as there's some declspec's that, I suspect, need adding to the upstream project (data symbols in Windows shared library evaleev/libint#237). I think this is ok wrt CFEP-18.

Checklist

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[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/libint2) and found some lint.

Here's what I've got...

For recipes/libint2:

• There are 1 too many lines. There should be one empty line at the end of the file.

For recipes/libint2:

• License is not an SPDX identifier (or a custom LicenseRef) nor an SPDX license expression.

Documentation on acceptable licenses can be found here.

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/libint2) and found some lint.

Here's what I've got...

For recipes/libint2:

• There are 1 too many lines. There should be one empty line at the end of the file.

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/libint2) and found it was in an excellent condition.

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/libint2) and found some lint.

Here's what I've got...

For recipes/libint2:

• Jinja2 variable definitions are suggested to take a {%<one space>set<one space><variable name><one space>=<one space><expression><one space>%} form. See lines [21]

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/libint2) and found it was in an excellent condition.

[awvwgk]

How does this recipe relate to https://github.com/conda-forge/libint-feedstock? Have just seen conda-forge/libint-feedstock#15.

[loriab]

closed in favor of dev release on existing libint feedstock conda-forge/libint-feedstock#17