re PR fortran/89724 (Fortran diagnostics give wrong line number because of math-vector-fortran.h header file)

	PR fortran/89724
	* scanner.c (load_line): Remove linenum and current_line static
	variables, add warned_tabs automatic variable.  Use current_file->line
	instead of current_line and warned_tabs boolean to avoid diagnosing
	tabs multiple times on the same line.

	* gfortran.dg/continuation_15.f90: New test.
	* gfortran.dg/continuation_16.f90: New test.

From-SVN: r269734