fix infinite symlink in documentation
https://bugzilla.gnome.org/show_bug.cgi?id=624690

Index: balsa-2.4.7/doc/Makefile.am
===================================================================
--- balsa-2.4.7.orig/doc/Makefile.am
+++ balsa-2.4.7/doc/Makefile.am
@@ -7,7 +7,6 @@ DOC_INCLUDES =
 DOC_FIGURES = figures/address-book-ldap.png			\
 	      figures/address-book-modify.png			\
 	      figures/address-book.png				\
-	      figures/address-book-start.png			\
 	      figures/address-book-vcard.png			\
 	      figures/balsa_logo.png				\
 	      figures/druid-start.png				\