Rename thread to _thread and dummy_thread to _dummy_thread. Issue #2875.
diff --git a/PC/os2vacpp/makefile b/PC/os2vacpp/makefile
index 93cae73..50119a0 100644
--- a/PC/os2vacpp/makefile
+++ b/PC/os2vacpp/makefile
@@ -868,7 +868,7 @@
$(PY_INCLUDE)\sliceobject.h $(PY_INCLUDE)\stringobject.h \
$(PY_INCLUDE)\sysmodule.h $(PY_INCLUDE)\traceback.h $(PY_INCLUDE)\tupleobject.h
-threadmodule.obj: $(PY_INCLUDE)\abstract.h $(PY_INCLUDE)\ceval.h \
+_threadmodule.obj: $(PY_INCLUDE)\abstract.h $(PY_INCLUDE)\ceval.h \
$(PY_INCLUDE)\classobject.h $(PY_INCLUDE)\cobject.h $(PY_INCLUDE)\complexobject.h \
pyconfig.h $(PY_INCLUDE)\dictobject.h $(PY_INCLUDE)\fileobject.h \
$(PY_INCLUDE)\floatobject.h $(PY_INCLUDE)\funcobject.h $(PY_INCLUDE)\import.h \