Regenerate configure files by new automake (v1.14.1), libtool (v2.4.2.418)

* Makefile.in: Regenerate (by autoreconf -vif using autoconf-2.69,
automake-1.14.1 and libtool-2.4.2.418).
* aclocal.m4: Likewise.
* config.guess: Likewise.
* config.sub: Likewise.
* configure: Likewise.
* include/private/config.h.in: Likewise.
* ltmain.sh: Likewise.
* m4/libtool.m4: Likewise.
* m4/ltoptions.m4: Likewise.
* m4/ltsugar.m4: Likewise.
* m4/ltversion.m4: Likewise.
* m4/lt~obsolete.m4: Likewise.
* missing: Likewise.
* test-driver: Likewise.