recipe/build: enable Teuchos_ENABLE_COMPLEX

[proppy]

• [x] Used a personal fork of the feedstock to propose changes
• [x] Bumped the build number (if the version is unchanged)
• [ ] Re-rendered with the latest conda-smithy (Use the phrase code>@<space/conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• [x] Ensured the license file is being packaged.

This would be required to package https://xyce.sandia.gov/, see https://docs.trilinos.org/dev/packages/teuchos/doc/html/index.html#Teuchos_config_options

[conda-forge-linter]

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 (recipe) and found it was in an excellent condition.

[proppy]

@conda-forge-admin, please rerender