fix(infoutils): use git --pretty=reference to avoid Windows escaping

On Windows escapeshellarg() replaces percent signs with spaces, so the
--pretty=format:%h %cd argument reached git as literal tex

fix(infoutils): use git --pretty=reference to avoid Windows escaping

On Windows escapeshellarg() replaces percent signs with spaces, so the
--pretty=format:%h %cd argument reached git as literal text. Git then
echoed the format string verbatim, a truthy value that made the version
display report an empty hash and the date "h" while skipping the working
.git-directory fallback.

The named --pretty=reference format carries no percent signs on the
command line, so the shell path works on Windows too. Its "hash
(subject, date)" output is validated before being trusted.

Introduced in b9e35b2f0.

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