fix(BSS2): provide PYTHONPATH for dependant builds

This is probably needed for test execution in workflow packages.

packages/hxtorch/package.py

@@ -128,6 +128,9 @@ class Hxtorch(WafPackage):
         env.set('WAF_CONFIGURE_LD_LIBRARY_PATH', ':'.join(library))
         env.prepend_path('PATH', ':'.join(path))
 
+    def setup_dependent_build_environment(self, env, dependent_spec):
+        env.prepend_path('PYTHONPATH', self.prefix.lib)
+
     def setup_run_environment(self, env):
         env.prepend_path('PYTHONPATH', self.prefix.lib)
 

packages/pynn-brainscales/package.py

@@ -104,6 +104,9 @@ class PynnBrainscales(WafPackage):
         env.set('WAF_CONFIGURE_LD_LIBRARY_PATH', ':'.join(library))
         env.prepend_path('PATH', ':'.join(path))
 
+    def setup_dependent_build_environment(self, env, dependent_spec):
+        env.prepend_path('PYTHONPATH', self.prefix.lib)
+
     def setup_run_environment(self, env):
         env.prepend_path('PYTHONPATH', self.prefix.lib)