build.rs: Clarify when Perl and pregenerated sources are used. #1963
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Perl is not needed when we are using pregenerated sources, and pregenerated sources are not used when Perl is used to generate them. Clarify this by using an enum that makes the mutual exclusion clear.
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Perl is not needed when we are using pregenerated sources, and pregenerated sources are not used when Perl is used to generate them. Clarify this by using an enum that makes the mutual exclusion clear.