local-unbound: remove stray config.h.in backup
despite being ignored in our main .gitignore, such files can still be merged from vendor branches. Reviewed by: cy Fixes:8f76bb7dad(unbound: Vendor import 1.18.0) MFC after: 2 weeks X-MFC with:8f76bb7dadDifferential Revision: https://reviews.freebsd.org/D41920
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