* acinclude.m4, configure.host: Support Bionic C library.
	* configure: Regenerate.
	* config/os/bionic/ctype_base.h, config/os/bionic/ctype_inline.h,
	* config/os/bionic/ctype_noincline.h, config/os/bionic/os_defines.h:
	New files, based on config/os/newlib/*.

From-SVN: r160096