gb_PYTHON_PRECOMMAND is only defined after gb_PYTHON
gb_PYTHON_PRECOMMAND is only defined after gb_PYTHON

...now that fa140733eeaf59030caa3115be4de11fb210b5b7 "fix dep on internal ucpp"
moved things around, so use "=" instead of ":=" here.  (And I'm not sure the
other places need ":=" either.)

Change-Id: Id71570c4a55ab08ca339801dec78ef06cfd80ef0

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core