Fix build-release to always update automake tools. (closes #3671)

1.5.22 and 1.5.23 include a version of "missing" older than the version
of automake/aclocal used to generate configure.

Fix the build-release script to always copy and force update of the
automake tools.

build-release

···
 
 # now, prepare the distribution tar balls
 
-automake
+automake --add-missing --copy --force-missing
 touch configure.ac
 make config.status
 ./config.status