FreeBSD/src a0909fb (r349193)sys/kern makesyscalls.sh

MFC r347228: makesyscalls: use @generated tag in generated files

Multiple tools use @generated to identify generated files (for example,
in a review Phabricator will by default hide diffs in generated files).
Use the @generated tag in makesyscalls.sh as we've done for other
generated files.

Sponsored by:   The FreeBSD Foundation
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+9-6sys/kern/makesyscalls.sh
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