Make trytond add all paths listed in GUIX_TRYTOND_MODULES_PATH to sys.path.

*** a/trytond/modules/__init__.py	1970-01-01 01:00:01.000000000 +0100
--- b/trytond/modules/__init__.py	2021-12-02 22:17:28.014612267 +0100
***************
*** 31,36 ****
--- 31,48 ----
  
  EGG_MODULES = {}
  
+ def __extend_python_path__():
+     tryton_python_path = os.environ.get("GUIX_TRYTOND_MODULES_PATH")
+     if tryton_python_path:
+         paths = [path[:-16]  # remove "/trytond/modules"
+                  for path in tryton_python_path.split(os.pathsep)]
+         sys.path.extend(paths)
+         # ensure new paths are in the pkg_resources WorkingSet
+         import pkg_resources
+         list(map(pkg_resources.working_set.add_entry, paths))
+ 
+ __extend_python_path__()
+ 
  
  def update_egg_modules():
      global EGG_MODULES
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<tr><td><span title='2016-12-17 14:46:42 +0100'>2016-12-17</span></td><td><a href='/guix/commit/doc/images/bootstrap-packages.dot?id=aaee461b9d5fb85fc1a548877dc7eea3dd4fbf50'>doc: Update dot graphs.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/images/bootstrap-packages.dot,
doc/images/coreutils-bag-graph.dot, doc/images/coreutils-graph.dot,
doc/images/shepherd-graph.dot: Regenerate.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-01-12 17:47:36 +0100'>2016-01-12</span></td><td><a href='/guix/commit/doc/images/bootstrap-packages.dot?id=d33fa0c71435396280aff94e7608c5c5be0e06a4'>doc: Show bootstrapping at the package level.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/images/bootstrap-packages.dot: New file.
* doc.am (DOT_FILES): Add it.
* doc/guix.texi (Bootstrapping): Show 'guix graph' commands.  Includes
'images/bootstrap-packages' and comment it.
</span></span></td><td>Ludovic Courtès</td></tr>