This allows keeping the code-sharing with the static linking.
This "fixes" a hypothetical ABI mismatch with wsutil and avoids pulling more
external dependencies to wsutil than strictly necessary.
A nice side-effect is that libwsutil no longer depends on version.h.
Follow up to f95976eefcbeb5d24df383c29d29ef888b503945.
Petri-Dish: João Valverde <firstname.lastname@example.org>
Tested-by: Petri Dish Buildbot <email@example.com>
Reviewed-by: João Valverde <firstname.lastname@example.org>