Fix debian/dpkg-dev.install to also list the new manpages.

The deb-symbols and dpkg-gensymbols man pages were missing in
the list of files to install in the dpkg-dev package.

debian/dpkg-dev.install

@@ -29,6 +29,8 @@ usr/share/man/*/*/deb-override.5
 usr/share/man/*/deb-override.5
 usr/share/man/*/*/deb-shlibs.5
 usr/share/man/*/deb-shlibs.5
+usr/share/man/*/*/deb-symbols.5
+usr/share/man/*/deb-symbols.5
 usr/share/man/*/*/deb-old.5
 usr/share/man/*/deb-old.5
 usr/share/man/*/*/deb.5
@@ -45,6 +47,8 @@ usr/share/man/*/*/dpkg-genchanges.1
 usr/share/man/*/dpkg-genchanges.1
 usr/share/man/*/*/dpkg-gencontrol.1
 usr/share/man/*/dpkg-gencontrol.1
+usr/share/man/*/*/dpkg-gensymbols.1
+usr/share/man/*/dpkg-gensymbols.1
 usr/share/man/*/*/dpkg-name.1
 usr/share/man/*/dpkg-name.1
 usr/share/man/*/*/dpkg-parsechangelog.1