autoconf: use autoconf 2.69 for generating

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
configure: allow stp being installed in /

I have stp in standard paths: /usr/include and /usr/lib64. Allow that
by correct STP_CFLAGS + STP_LDFLAGS instead of STP_ROOT. Those are
empty when --with-stp is not passed.

configure is regenerated by autoconf too.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Executor: do not crash on non-sized globals

Sometimes, globals are not sized and ->getTypeStoreSize on such type
crashes inside the LLVM. Check whether type is sized prior to calling
the function above.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>