Add extra flags for _bootstrap_python

Author: naveen521kk

Makefile.pre.in

@@ -1010,7 +1010,7 @@ BOOTSTRAP_HEADERS = \
 Programs/_bootstrap_python.o: Programs/_bootstrap_python.c $(BOOTSTRAP_HEADERS) $(PYTHON_HEADERS)
 
 _bootstrap_python: $(LIBRARY_OBJS_OMIT_FROZEN) Programs/_bootstrap_python.o Modules/getpath.o Modules/Setup.local
-	$(LINKCC) $(PY_LDFLAGS_NOLTO) -o $@ $(LIBRARY_OBJS_OMIT_FROZEN) \
+	$(LINKCC) $(PY_LDFLAGS_NOLTO) -o $@ -municode -mwindows $(LIBRARY_OBJS_OMIT_FROZEN) \
 		Programs/_bootstrap_python.o Modules/getpath.o $(LIBS) $(MODLIBS) $(SYSLIBS)