distcheck: Include .version to fix build on newer versions

echo 1.3.0.66-35f9 > ../../.version-t && mv ../../.version-t ../../.version
/bin/bash: ../../.version-t: Permission denied
Makefile:786: recipe for target '../../.version' failed

Makefile.am

@@ -8,3 +8,5 @@ $(top_srcdir)/.version:
 	echo $(VERSION) > $@-t && mv $@-t $@
 dist-hook:
 	echo $(VERSION) > $(distdir)/.tarball-version
+
+EXTRA_DIST = .version