Create a libopenbmc_intf symlink

Create a libopenbmc_intf symlink in the build target to
enable things like:

 -L ../libopenbmc_intf -lopenbmc_intf

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/libopenbmc_intf/Makefile b/libopenbmc_intf/Makefile
index 156767a..f82bce5 100644
--- a/libopenbmc_intf/Makefile
+++ b/libopenbmc_intf/Makefile
@@ -8,6 +8,7 @@
 $(LIBOBMC): %: %.o gpio.o
 	$(CC) -shared $(CFLAGS) $(LDFLAGS) -Wl,-soname,lib$(LIBOBMC).so \
 		-o lib$@.so.1 $^ $(LDLIBS)
+	ln -sf lib$(LIBOBMC).so.1 lib$(LIBOBMC).so
 
 install-headers:
 	@mkdir -p $(DESTDIR)$(includedir)
@@ -20,5 +21,6 @@
 
 clean-lib:
 	rm -f lib$(LIBOBMC).so.1
+	rm -f lib$(LIBOBMC).so
 
 include ../rules.mk