package/libsigc: add license hash

Signed-off-by: Adam Duskett <Aduskett@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/libsigc/libsigc.hash

@@ -1,2 +1,5 @@
 # From http://ftp.gnome.org/pub/gnome/sources/libsigc++/2.10/libsigc++-2.10.0.sha256sum
 sha256	f843d6346260bfcb4426259e314512b99e296e8ca241d771d21ac64f28298d81	libsigc++-2.10.0.tar.xz
+
+# Locally calculated
+sha256	5bbcbb737e60fe9deba08ecbd00920cfcc3403ba2e534c64fdeea49d6bb87509	COPYING