BuildVars: add missing SpeechDictionaries import (#20)

Author: josephsl

buildVars.py

@@ -1,7 +1,7 @@
 # Build customizations
 # Change this file instead of sconstruct or manifest files, whenever possible.
 
-from site_scons.site_tools.NVDATool.typings import AddonInfo, BrailleTables, SymbolDictionaries
+from site_scons.site_tools.NVDATool.typings import AddonInfo, BrailleTables, SymbolDictionaries, SpeechDictionaries
 
 # Since some strings in `addon_info` are translatable,
 # we need to include them in the .po files.