How to separate the postinst in a multi-binary package w/ debhelp ?

[Yves Arrouye <yves@realnames.com>]

I am sure it's an FAQ, sorry... I am making a package with a library package
and a development package. I started with debhelper. My debian/postinst and
debian/postrm call ldconfig. Now what happens is that they end up in my
libxxx-dev package, not my libxxx1 one (which is populated using
dh_movefiles -plibxxx1). How can I have these postinst go to the right
package? I have no idea where to move them so that they get picked up when
the package is made.

Thanks!
YA
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