* gcc-interface/lang.opt (fbuiltin-printf): Accept.
	* gcc-interface/misc.c (gnat_handle_option): Ignore it.
	* gcc-interface/lang-specs.h (@ada, @adawhy, @adascil): Propagate -f*
	flags as -g* and -m* flags past -gnatez.

Co-Authored-By: Olivier Hainque <hainque@adacore.com>

From-SVN: r228381