Contribs: Update Freetype and libass

Cf CVE-2011-0226

contrib/src/ass/SHA512SUMS

-345b5138875a31bce4f08bd378ab064d01b26cb51df2010056970158e8f845519f4aedebb0e0609200781e9e28e000ceba17b30e81ba5925f97499b09347e461  libass-0.9.12.tar.gz
+d093a3cd4ff832b82b2648bdc22d0fa4f786e90fb10ca19c35327e79ac5117177fc882615816b4d0bba61cf89b5c49af30bab8cef2367ee3d318d1e76437e9de  libass-0.9.13.tar.gz

contrib/src/ass/rules.mak

 # ASS
-ASS_VERSION := 0.9.12
+ASS_VERSION := 0.9.13
 ASS_URL := http://libass.googlecode.com/files/libass-$(ASS_VERSION).tar.gz
 
 PKGS += ass

contrib/src/freetype2/SHA512SUMS

-0d01e2dbc7bcde434dfd6301adc753e4b62f98ef8fcd80a566e0c10a62f2b51783e911a5bd3c359c033833e0235617b86cc5c8570775672970efa7408adf754d  freetype-2.4.5.tar.gz
+6287dcc928314db3f0b30ebc1f4b14f017ccb6b7c5aa9cac32c831b37944c1fc356cdc98db5ef30dc334ae39aeea86edaae56c56f60905452a18c7dd7aa5507d  freetype-2.4.6.tar.gz

contrib/src/freetype2/rules.mak

 # freetype2
 
-FREETYPE2_VERSION := 2.4.5
+FREETYPE2_VERSION := 2.4.6
 FREETYPE2_URL := $(SF)/freetype/freetype-$(FREETYPE2_VERSION).tar.gz
 
 PKGS += freetype2