Merging compatible build string pinning doesn't work.

[isuruf]

Adding in variants from internal_defaults
INFO conda_build.variants:_combine_spec_dictionaries(188): Adding in variants from internal_defaults
INFO conda_build.variants:_combine_spec_dictionaries(188): Adding in variants from /opt/conda/conda_build_config.yaml
INFO conda_build.variants:_combine_spec_dictionaries(188): Adding in variants from /home/conda/.ci_support/linux64.yaml
INFO conda_build.variants:_combine_spec_dictionaries(188): Adding in variants from config.variant
Adding in variants from /opt/conda/conda_build_config.yaml
Adding in variants from /home/conda/.ci_support/linux64.yaml
Adding in variants from config.variant
Attempting to finalize metadata for cartopy_offlinedata
    % (self.raw_value, other.raw_value))
ValueError: Incompatible component merge:
  - '*_cp*'
  - '*_cp35m'

[github-actions]

Hi there, thank you for your contribution!

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