makepkg: print "SKIP" for signature checksums

There are valid reasons for a source files PGP signature to be changed
(expired key, expired signature, additional person signing...). Thus
providing a checksum for signature files can potentially cause a
PKGBUILD to require unnecessary updating.

Avoid this issue by using "SKIP" for the signature checksum.
Fixes FS#31590.

Signed-off-by: Allan McRae <allan@archlinux.org>

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