Make the number that represents the major version number a single digit instead

Make the number that represents the major version number a single digit instead
of 2.  Using two digits makes it an octal number when put into version.h, which
breaks the compilation of any out of tree module that checks the version for
any version after 1.2.7 (reported by Matteo Brancaleoni on the asterisk-dev
mailing list, who gave credit to vihai for pointing it out)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@50227 65c4cc65-6c06-0410-ace0-fbb531ad65f3