* guix/cve.scm: Exploit cpe vendors information.
(cpe->package-name): Rename to...
(cpe->package-identifier): Renamed from cpe->package-name. Use
cpe_vendor:cpe_name in place or cpe_name.
(vulnerabily-matches?): Add helper function.
(vulnerabilities->lookup-proc): Extract cpe_name for table
hashes. Add vendor and hidden-vendor arguments. Adapt condition to
pass vulnerabilities to result in the fold.
(write-cache, fetch-vulnerabilities): Update the format version.
* guix/lint.scm (package-vulnerabilities): Use additional arguments
from vulnerabilities->lookup-proc.
* tests/cve.scm (%expected-vulnerabilities): Adapt variable to changes
in guix/cve.scm.
Signed-off-by: Zheng Junjie <z572@z572.online>
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