Regenerate configure files by autoconf-2.69, automake-1.13.4

* configure: Regenerate (by autoreconf -vif using autoconf-2.69,
automake-1.13.4 and libtool-2.4.2).
* Makefile.in: Likewise.
* aclocal.m4: Likewise.
* compile: Likewise.
* config.guess: Likewise.
* config.sub: Likewise.
* configure: Likewise.
* depcomp: Likewise.
* install-sh: Likewise.
* ltmain.sh: Likewise.
* m4/libtool.m4: Likewise.
* missing: Likewise.
* mkinstalldirs: Likewise.
* test-driver: New generated file.
Replace deprecated [CXX]INCLUDES to AM_C[PP]FLAGS in configure.ac
(Apply commit cd6cb86 from 'master' branch.)

* configure.ac (INCLUDES): Replace with AM_CFLAGS (as the former is
deprecated in Automake 1.13.4).
* configure.ac (CXXINCLUDES): Replace with AM_CPPFLAGS.

Conflicts:

    configure.ac
tests: Append _test suffix to 'initsecondarythread' binary file names
(Apply commit 2695007 from 'master' branch.)

* tests/tests.am (TESTS, check_PROGRAMS, initsecondarythread_SOURCES,
initsecondarythread_LDADD): Rename initsecondarythread to
initsecondarythread_test (except for .c file).
* .gitignore: Likewise.

Conflicts:

    tests/tests.am
.gitignore: Ignore .gch files
.gitignore: Ignore *.log, *.trs files produced by 'make check' (Autoconf)
(Apply commit f346b01 from 'master' branch.)

Conflicts:

    .gitignore
.gitignore: Ignore cord/tests/de_win.res
Update (regenerate) configure files; update ChangeLog

* configure: Regenerate.
* Makefile.in: Likewise.