scanner.c (load_line): Add pbuflen argument, don't make buflen static.

	* scanner.c (load_line): Add pbuflen argument, don't make
	buflen static.  If maxlen == 0 or preprocessor_flag,
	don't truncate at buflen, but at maxlen.  In xrealloc add
	1 byte at the end for the terminating '\0'.  Don't fill
	with spaces up to buflen, but gfc_option.fixed_line_length.
	(load_file): Adjust load_line caller.  Add line_len variable.

	* gfortran.dg/longline.f: New test.

From-SVN: r101718