Undeprecate libarchive calls; Patch by Christian Hesse.
Fix possibly uninitialized variables; patch by Christian Hesse
Add missing include; patch by Christian Hesse
Remove unused variables; patch by Christian Hesse
fix build warning
fix building RSSyl
Get rid of non-existent CLAWS_MAIL_CFLAGS in Makefile templates where it was forgotten.
Get rid of unneeded GTK_CFLAGS in Makefile template for rssyl/libfeed.