Log Message:
Fix an issue that bothered me ever since I started working on the
bulk build code. emacs-w3m uses EMACS_FLAVOR and EMACS_VERSION_MAJOR
to conditionally add a build time dependency on Mule-UCS. The latter
variable is not set when no emacs package is installed though and
therefore a dependency got added between scan phase and build phase,
possibly resulting in multiple builds of Mule-UCS in older
(non-pbulk) bulk builds. Fix this by switching to EMACS_TYPE for
the logic.