No config set when using conda_build.api.build() directly from metadata

This MR implements a change in the use of conda_build.api.build() in the specific cases we are building from the resolved metadata. It reverts using metadata to run the build as that has proved not be reliable.

See:

• https://gitlab.idiap.ch/bob/bob.measure/-/jobs/159689
• closes bob/bob.conda#68

added 1 commit

• 2a3939e6 - [build] Completely reverts building from metadata (does not work properly)

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mentioned in commit ac1e9f27