configure.host: Add support for *-tpf.

	* configure.host: Add support for *-tpf.
	* crossconfig.m4: Likewise.
	* configure: Regenerate.
	* config/os/tpf: New directory.
	* config/os/tpf/os_defines.h: New file.
	* config/os/tpf/ctype_base.h: Likewise.
	* config/os/tpf/ctype_inline.h: Likewise.
	* config/os/tpf/ctype_noninline.h: Likewise.

Co-Authored-By: PJ Darcy <darcypj@us.ibm.com>

From-SVN: r76724