fix merge_build_host functionality. Empty host section splits envs. #2896
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fixes #2887
Note that this changes some behavior with run_exports. If a strong run_exports is present in the build section, any weak run_exports in the build section will not apply, because the strong run_export creates the host section with its injection of the strong run_exports.
This also switches from the yaml BaseLoader to the default. This interprets booleans more directly. I have attempted to keep the version number parsing as a string, but there may be some small issues that the test suite doesn't cover.