c46f5680ca
This commits adds version_is_valid_versionspec and uses it in analyze-compare-version.c. version_is_valid_versionspec differs from version_is_valid in that it acepts empty strings and since valid characters in a version spec version are all ASCII letters and digits as well as "-.~^", but ",_+" allowed by version_is_valid are not. Also give a more specific warning message on invalid characters.
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