[CONFIGURATION] * NEW: Update configuration files to autoconf 2.71.
* NEW: Do not use deprecated autoconf macros anymore. * NEW: The version information is now located in the 'version.m4' file in the source root directory. git-svn-id: svn://localhost/gambas/trunk@6230 867c0c6c-44f3-4631-809d-bfa615b0a4ec