libndn-nac.pc.in: fix cannot find -llibndn-nac error while linking in other projects

Change-Id: I65f0d1f67aa9264da9b19e4fa3b9fad6db5ce658
diff --git a/libndn-nac.pc.in b/libndn-nac.pc.in
index 6b049ff..0e44ffa 100644
--- a/libndn-nac.pc.in
+++ b/libndn-nac.pc.in
@@ -5,5 +5,5 @@
 Name: libndn-nac
 Description: NDN Name-Based Access Control library
 Version: @VERSION@
-Libs: -L${libdir} -llibndn-nac
+Libs: -L${libdir} -lndn-nac
 Cflags: -I${includedir}