emaste 1319313760 newvers.sh: fix git false positive -dirty tag
Assuming that any output from `git diff-index --name-only` implies
changes in the working tree results in false positives: files with
metadata, but not content, changes are also listed.

Check that content differences exist before adding the -dirty tag to
the git hash.

PR:		229230
Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D15968
2018-11-02 21:20:46 +00:00
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