Prevent calling Git to obtain date of the last commit, and hardcode
[last_git_commit] value to match package version.

Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -22,8 +22,7 @@ dnl along with this program; if not, write to the Free
 dnl Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 dnl PACKAGE_VERSION will be either "" if not using git, or date of the last git commit in the form YYYYMMDD
-m4_define([last_git_commit], patsubst(m4_esyscmd([git log -n 1 --date=short --format=format:%cd]), [[^0-9]]))
-AC_INIT([schismtracker],[last_git_commit])
+AC_INIT([schismtracker],[20221201])
 
 AC_CONFIG_SRCDIR([schism/main.c])