builtins.def (BUILT_IN_FPUTC, [...]): Remove nothrow attribute.

	* builtins.def (BUILT_IN_FPUTC, BUILT_IN_FPUTC_UNLOCKED,
	BUILT_IN_FPUTS, BUILT_IN_FPUTS_UNLOCKED, BUILT_IN_FWRITE,
	BUILT_IN_FWRITE_UNLOCKED, BUILT_IN_PUTCHAR, BUILT_IN_PUTCHAR_UNLOCKED,
	BUILT_IN_PUTS, BUILT_IN_PUTS_UNLOCKED): Remove nothrow attribute.
	* builtin-attrs.def (ATTR_NONNULL_1, ATTR_NONNULL_2, ATTR_NONNULL_1_2,
	ATTR_NONNULL_1_4): New.

From-SVN: r88278