So that translations can be handled more flexibly, rather than having to
translate the message text within the checker.
* guix/scripts/lint.scm (lint-warning-message-text,
lint-warning-message-data): New procedures.
(lint-warning-message): Remove record field accessor, replace with procedure
that handles the lint warning data and translating the message.
(make-warning): Rename to %make-warning.
(make-warning): New macro.
(emit-warnings): Handle the message-text and message-data fields.
(check-description-style): Adjust for changes to make-warning.
[check-trademarks, check-end-of-sentence-space): Adjust for changes to
make-warning.
(check-inputs-should-be-native, check-inputs-should-not-be-an-input-at-all,
check-synopsis-style, validate-uri, check-home-page, check-patch-file-names,
check-gnu-synopsis+description, check-mirror-url, check-github-url,
check-derivation, check-vulnerabilities, check-for-updates,
report-tabulations, report-trailing-white-space, report-long-line,
report-lone-parentheses): Adjust for changes to make-warning.
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