Fix double reference to this file to work with recent autoconf+automake

RP 1/2/10

Index: libtelepathy-0.3.3/src/Makefile.am
===================================================================
--- libtelepathy-0.3.3.orig/src/Makefile.am	2010-02-01 13:13:50.869038984 +0000
+++ libtelepathy-0.3.3/src/Makefile.am	2010-02-01 13:14:23.267789456 +0000
@@ -27,7 +27,6 @@
     tp-chan-type-text-gen.h \
     tp-chan-type-tubes-gen.h \
     tp-conn-iface-aliasing-gen.h \
-    tp-conn-iface-avatars-gen.h \
     tp-conn-iface-capabilities-gen.h \
     tp-conn-iface-contact-info-gen.h \
     tp-conn-iface-forwarding-gen.h \
