K 10
svn:author
V 8
dumbbell
K 8
svn:date
V 27
2018-01-05T23:33:42.260362Z
K 7
svn:log
V 337
lang/rust: Skip `.cargo-checksum.json` update when it's missing

Currently we need to update `.cargo-checksum.json` in several patched
crates. But those crates are missing from the sources if they come from
GitHub instead of a proper released source archive. This change makes
`post-patch` and `do-configure` recipes fine in both cases.

END