Packaging: Auto-generate changelog during configure

Auto-generate changelog based off on @VERSION@ during configure,
so that it is not needed to be update with new releases / version
updates.

Signed-off-by: Umer Saleem <usaleem@ixsystems.com>

.gitignore

@@ -82,6 +82,7 @@
 modules.order
 Makefile
 Makefile.in
+changelog
 nfs41acl.h
 nfs41acl_xdr.c
 *.patch

configure.ac

@@ -69,6 +69,7 @@ ZFS_AC_DEBUG_INVARIANTS
 
 AC_CONFIG_FILES([
 	contrib/debian/rules
+	contrib/debian/changelog
 	Makefile
 	include/Makefile
 	lib/libzfs/libzfs.pc

contrib/debian/changelog.in

@@ -1,3 +1,9 @@
+openzfs-linux (@VERSION@-1) unstable; urgency=low
+
+  * OpenZFS @VERSION@ is tagged.
+
+ -- Umer Saleem <usaleem@ixsystems.com>  Wed, 15 Nov 2023 15:00:00 +0500
+
 openzfs-linux (2.2.0-0) unstable; urgency=medium
 
   * Merge tag zfs-2.2.0