Add beta version numbering for gnupg-vsd
* configure.ac (BUILD_BETANUM): Set and subst it. * src/gpg4win.mk.in: Add a fixed -Beta to VSD_VERSION for files to make it clear they are beta. (gnupg-vsd/$(1)/VERSION: depend on betanum (stamp-betanum): New, update file when betanum changes.
This should reduce regenerating VERSION files if the
beta is not changed. Mostly the change is to VSD_VERSION
which is now including the BUILD_BETANUM.