common: New function compare_version_strings.
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Description

common: New function compare_version_strings.

* common/stringhelp.c (parse_version_number): New.
(parse_version_string): New.
(compare_version_strings): New.
* common/t-stringhelp.c (test_compare_version_strings): New.
(main): Call test.  Return ERRCOUNT instead of 0.

The code for that function is based on code from libgcrypt. Similar
code is in all GnuPG related libraries this function is
a candidates for inclusion in libgpg-error.