Log Message:
Update libast to 0.7.
(CVE-2006-0224 was already fixed by patch-aa in pkgsrc).
XXX: self test failed on NetBSD-5.0.1, but old version also failed.

Changes: The string class is now both an interface and an implementation, so
parallel implementations (e.g., a glib string wrapper) can be created. Detection
of Imlib2 support and a pixmap leak when it was disabled have been fixed. Fixes
have been made for gcc4/newer autotools. This release also contains a fix for
CVE-2006-0224, a buffer overflow which could lead to privilege escalation in set
uid/setgid apps using LibAST's configuration engine.