[ci skip] Add python to host requirements

Add python to host requirements, to ensure that the test package
is built (and therefore tested) for all Python versions.

Fixes #426

Signed-off-by: Michał Górny <[email protected]>

Author: mgorny

recipe/meta.yaml

@@ -358,6 +358,8 @@ outputs:
       string: cpu_{{ blas_impl }}_py{{ CONDA_PY }}_h{{ PKG_HASH }}_{{ build }}                                                 # [cuda_compiler_version == "None"]
       detect_binary_files_with_prefix: false
     requirements:
+      host:
+        - python
       run:
         - pytorch {{ version }} cuda*_{{ blas_impl }}_py{{ CONDA_PY }}*{{ build }}   # [cuda_compiler_version != "None"]
         - pytorch {{ version }} cpu_{{ blas_impl }}_py{{ CONDA_PY }}*{{ build }}     # [cuda_compiler_version == "None"]