f2003_io_4.f03, [...]: Gate test on effective_target fd_truncate.

f2003_io_4.f03, [...]: Gate test on effective_target fd_truncate.

	* gfortran.dg/f2003_io_4.f03, gfortran.dg/read_size_noadvance.f90,
	gfortran.dg/namelist_39.f90, gfortran.dg/read_repeat.f90,
	gfortran.dg/fmt_exhaust.f90, gfortran.dg/fseek.f90,
	gfortran.dg/fmt_t_7.f, gfortran.dg/read_x_past.f,
	gfortran.dg/read_bad_advance.f90, gfortran.dg/backslash_3.f,
	gfortran.dg/namelist_56.f90, gfortran.dg/list_read_5.f90,
	gfortran.dg/fmt_cache_1.f, gfortran.dg/fmt_t_4.f90: Gate test on
	effective_target fd_truncate.

From-SVN: r149524