Ignore invalid top-level environment variable config keys #2952
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This changes it so that top-level environment variable config keys like `MDBOOK_FOO` are ignored instead of generating an error. It's just too inconvenient since it is common for users to set environment variables like `MDBOOK_VERSION` or whatever for their own scripts.
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This changes it so that top-level environment variable config keys like
MDBOOK_FOOare ignored instead of generating an error. It's just too inconvenient since it is common for users to set environment variables likeMDBOOK_VERSIONor whatever for their own scripts.