Extend system-info with information about OIIO, OCIO and OSL

Summary:
Version of those libraries might be useful to know.

- OIIO and OCIO is exposed via bpy.app.oiio and bpy.app.ocio.
  There're "supported", "version" and "version_string" defined
  in those modules.

- OSL is available as _cycles.osl_version and _cycles.osl_version_string.

Reviewers: campbellbarton

Reviewed By: campbellbarton

CC: dingto

Differential Revision: http://developer.blender.org/D79

source/blender/python/SConscript

@@ -183,8 +183,13 @@ if env['WITH_BF_SMOKE']:
 if env['WITH_BF_COLLADA']:
     defs.append('WITH_COLLADA')
 
-if env['WITH_BF_OIIO']:
+if env['WITH_BF_OCIO']:
     defs.append('WITH_OCIO')
+    incs += ' ' + '#/intern/opencolorio'
+
+if env['WITH_BF_OIIO']:
+    defs.append('WITH_OPENIMAGEIO')
+    incs += ' ../../imbuf/intern/oiio'
 
 if env['WITH_BF_PLAYER']:
     defs.append('WITH_PLAYER')