The TOOLSVERSION was inconsistent in configure.ac and Makefile:
* Rename the second parameter to AC_INIT() into short_version
* Calculate TOOLSVERSION during configure and use it to
  generate version.c from version.c.in
* For now, leave duplicate TOOLSVERSION in Makefile (for make dist)

Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>