p7zip: do not install docs, which also fixes uninstallation (due to wrong directory permission)

component/p7zip/buildout.cfg

@@ -7,6 +7,6 @@ recipe = slapos.recipe.cmmi
 url = http://downloads.sf.net/project/p7zip/p7zip/${:version}/p7zip_${:version}_src_all.tar.bz2
 version = 9.38.1
 md5sum = 6cba8402ccab2370d3b70c5e28b3d651
-configure-command = true
+configure-command = rm -r DOC
 make-options =
   DEST_HOME=${buildout:parts-directory}/${:_buildout_section_name_}