pylibfdt: Use setup.py to build the swig file

Since we are using the standard .i extension for the swig file, we can use
setup.py to build the wrapper. Drop the existing build code since it is
not needed.

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

pylibfdt/Makefile.pylibfdt

@@ -1,8 +1,8 @@
 # Makefile.pylibfdt
 #
 
-PYLIBFDT_srcs = $(addprefix $(LIBFDT_srcdir)/,$(LIBFDT_SRCS))
-WRAP = $(PYLIBFDT_objdir)/libfdt_wrap.c
+PYLIBFDT_srcs = $(addprefix $(LIBFDT_srcdir)/,$(LIBFDT_SRCS)) \
+		$(PYLIBFDT_srcdir)/libfdt.i
 PYMODULE = $(PYLIBFDT_objdir)/_libfdt.so
 
 define run_setup
@@ -11,18 +11,14 @@ define run_setup
 	$(PYLIBFDT_objdir)/setup.py --quiet $(2)
 endef
 
-$(PYMODULE): $(PYLIBFDT_srcs) $(WRAP)
+$(PYMODULE): $(PYLIBFDT_srcs)
 	@$(VECHO) PYMOD $@
 	$(call run_setup, $^, build_ext --inplace)
 	mv _libfdt.so $@
 
-$(WRAP): $(PYLIBFDT_srcdir)/libfdt.i
-	@$(VECHO) SWIG $@
-	$(SWIG) -python -o $@ $<
-
-install_pylibfdt: $(WRAP) $(PYMODULE)
+install_pylibfdt: $(PYMODULE)
 	$(VECHO) INSTALL-PYLIB; \
-	$(call run_setup, $(PYLIBFDT_srcs) $(WRAP), \
+	$(call run_setup, $(PYLIBFDT_srcs), \
 		install $(if $(SETUP_PREFIX),--prefix=$(SETUP_PREFIX)))
 
 PYLIBFDT_cleanfiles = libfdt_wrap.c libfdt.py libfdt.pyc _libfdt.so