namelist_51.f90, [...]: Gate test on effective_target fd_truncate.

namelist_51.f90, [...]: Gate test on effective_target fd_truncate.

	* gfortran.dg/namelist_51.f90, gfortran.dg/utf8_2.f03,
	gfortran.dg/namelist_48.f90, gfortran.dg/read_repeat.f90,
	gfortran.dg/streamio_9.f90, gfortran.dg/widechar_IO_1.f90,
	gfortran.dg/namelist_50.f90, gfortran.dg/namelist_52.f90,
	gfortran.dg/utf8_1.f03, gfortran.dg/namelist_56.f90,
	gfortran.dg/namelist_49.f90: Gate test on effective_target
	fd_truncate.
	* gfortran.dg/widechar_IO_3.f90: Ditto.  Fix typo in comment.

From-SVN: r145580