* strnlen.c: New file.
	* configure.ac: Check for strnlen, add it to AC_LIBOBJ if it's not
	present.
	* Makefile.in: Rebuild dependencies.
	(CFILES): Add strnlen.c.
	(CONFIGURED_OFILES): Add ./strnlen.$(objext).
	* configure, config.in, functions.texi: Rebuild.

	* maint-tool: Accept .def files in the include directory.

From-SVN: r191432