pylibfdt: Don't silence setup.py when V=1

At the moment we unconditionally pass --quiet to setup.py.  Change that to
get more debugging output from it when V=1 is passed to make.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Simon Glass <sjg@chromium.org>

pylibfdt/Makefile.pylibfdt

@@ -5,10 +5,15 @@ PYLIBFDT_srcs = $(PYLIBFDT_srcdir)/libfdt.i
 PYMODULE = $(PYLIBFDT_objdir)/_libfdt.so
 
 SETUP = $(PYLIBFDT_srcdir)/setup.py
+SETUPFLAGS =
+
+ifndef V
+SETUPFLAGS += --quiet
+endif
 
 define run_setup
 	VERSION="$(dtc_version)"
-	$(SETUP) --quiet $(1)
+	$(SETUP) $(SETUPFLAGS) $(1)
 endef
 
 $(PYMODULE): $(PYLIBFDT_srcs) $(LIBFDT_archive) $(SETUP)