options.c (gfc_init_options): Don't warn about the use GNU extensions by default.

	* options.c (gfc_init_options): Don't warn about the use GNU
	extensions by default.
	(gfc_post_options): Warn about GNU extensions with -pedantic.
	(gfc_handle_option): Don't warn about GNU extensions with -std=gnu.

From-SVN: r85413