pythongh-104487: PYTHON_FOR_REGEN must be minimum Python 3.8

Author: erlend-aasland

configure.ac

@@ -202,7 +202,7 @@ AC_SUBST([FREEZE_MODULE_DEPS])
 AC_SUBST([PYTHON_FOR_BUILD_DEPS])
 
 AC_CHECK_PROGS([PYTHON_FOR_REGEN],
-  [python$PACKAGE_VERSION python3.11 python3.10 python3.9 python3.8 python3.7 python3.6 python3 python],
+  [python$PACKAGE_VERSION python3.11 python3.10 python3.9 python3.8 python3 python],
   [python3])
 AC_SUBST(PYTHON_FOR_REGEN)