Automatically add .* to requirements with <pkg> <version>

[jakirkham]

When adding a requirement of the form <pkg> <version>, conda-build would intuit this as <pkg> <version>.*. It looks like rattler-build does not do this and expects it to be specified.

For example with syntax like this...

requirements:
  host:
    - python ${{ python_min }}
    - pip
    - setuptools
  run:
    - python >=${{ python_min }}

...rattler-build produces the following error...

Error: 
  × an unspecified error occurred.
    ╭─[recipe/recipe.yaml:21:7]
 20 │   host:
 21 │     - python ${{ python_min }}
    ·       ────────────┬───────────
    ·                   ╰── This match spec is ambiguous. Do you mean `python ==3.9` or `python 3.9.*`?
 22 │     - pip
    ╰────

[mgorny]

Duplicate of #1174