* lang.opt (fdec-include): New option.
	* options.c (set_dec_flags): Set also flag_dec_include.
	* scanner.c (include_line): Change return type from bool to int.
	In fixed form allow spaces in between include keyword letters.
	For -fdec-include, allow in fixed form 0 in column 6.  With
	-fdec-include return -1 if the parsed line is not full include
	statement and it could be successfully completed on continuation
	lines.
	(include_stmt): New function.
	(load_file): Adjust include_line caller.  If it returns -1, keep
	trying include_stmt until it stops returning -1 whenever adding
	further line of input.

	* gfortran.dg/include_10.f: New test.
	* gfortran.dg/include_10.inc: New file.
	* gfortran.dg/include_11.f: New test.
	* gfortran.dg/include_12.f: New test.
	* gfortran.dg/include_13.f90: New test.
	* gfortran.dg/gomp/include_1.f: New test.
	* gfortran.dg/gomp/include_1.inc: New file.
	* gfortran.dg/gomp/include_2.f90: New test.

Co-Authored-By: Mark Eggleston <mark.eggleston@codethink.com>

From-SVN: r266337