build docs with openjade as well

[Matthias Klose]

newer(?), at least compatible versions of jade are available under the
name openjade (1.4), which work ok for building the documentation.


--- qmdist/command/build_doc.py~	2004-07-25 23:48:41.000000000 +0200
+++ qmdist/command/build_doc.py	2004-10-27 09:29:44.000000000 +0200
@@ -99,7 +99,7 @@
                             'qm/test/doc/tour.xml',
                             'qm/test/doc/reference.xml'])
         
-        jade = find_executable('jade')
+        jade = find_executable('jade') or find_executable('openjade')
         dcl = find_file(map(normpath,
                             ['/usr/share/doc/jade*/pubtext/xml.dcl',
                              '/usr/share/doc/openjade*/pubtext/xml.dcl',