* configure.ac: Rename my_foo variables to mym4_foo variables to make
clear that they are processed by m4.
(VERSION_NUMBER): New ac_subst.
(AH_BOTTOM): Add CRIGHTBLURB macro.
(BUILD_REVISION, BUILD_FILEVERSION, BUILD_TIMESTAMP): Change them to
work similar to libgpg-error et al.
* src/versioninfo.rc.in: Remove use of BUILD_NUMBER and get it in line
with gpg-error et al.
* src/version.c (cright_blurb): New.
(gpgme_check_version_internal): Add magic to display the above
information.
* tests/t-version.c (main): Add option --verbose.
We would need to use a shortened commit id so that it fits into an 16
bit Windows variable. Further it is a random number and not something
increasing. Thus a build number made up from the day of the year and
the hour is much more useful to describe a build number for a specific
revision.
* configure.ac [W32]: Replace BUILD_REVISION by BUILD_NUMBER.
* src/versioninfo.rc.in: Ditto.
