libselinux: additional makefile support for rubywrap

SELinux ruby bindings didn't build from the top level
the swig generated .c file wasn't gitignored
use pkg-config for ruby info like we do for python

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Dan Walsh <dwalsh@redhat.com>
diff --git a/Makefile b/Makefile
index 09c2c1e..f71faab 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@
 		(cd $$subdir && $(MAKE) $@) || exit 1; \
 	done
 
-install-pywrap swigify:
+install-pywrap install-rubywrap swigify:
 	@for subdir in $(PYSUBDIRS); do \
 		(cd $$subdir && $(MAKE) $@) || exit 1; \
 	done