As pointed by Douglas Torrance, there are some case where the 2 docs
INSTALL-WMAKER and README.i18n are not re-generated properly, one of the
cases being if the user grabs the sources from Git to make a source package
only (ie, without compiling anything).
This patch adds a hook to "make dist" so it will re-generate the docs if
needed. Because the "dist-hook" is run after Automake has copied the files
to the temporary directory (distdir) then we also include an explicit copy
of the files there to have the latest version.
Signed-off-by: Christophe CURIS <christophe.curis@free.fr>