configury: bump version number to 5.1.2,
configury: bump version number to 5.1.2,

* configure.ac (AC_INIT): Bump version number to 5.1.2,

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

GUI/lyaml,GUI/lyaml