Update file position for inquire lazily.

Update file position for inquire lazily.

libgfortran ChangeLog:

2011-10-31  Janne Blomqvist  <jb@gcc.gnu.org>

	* io/inquire.c (inquire_via_unit): Check whether we're at the
	beginning or end if the position is unspecified. If the position
	is not one of the 3 standard ones, return unspecified.
	* io/io.h (update_position): Remove prototype.
	* io/transfer.c (next_record): Set the position to unspecified,
	letting inquire figure it out more exactly when needed.
	* io/unit.c (update_position): Remove function.

testsuite ChangeLog:

2011-10-31  Janne Blomqvist  <jb@gcc.gnu.org>

	* gfortran.dg/inquire_5.f90: Update testcase to match the standard
	and current implementation.

From-SVN: r180703