[patch, fortran] PR38425 I/O: POS= compile-time diagnostics

[Jerry DeLisle]

This simple patch adds some missing constraints.

Regression tested on x86-64-linux-gnu.

Will commit under obvious and simple rule.

Jerry

2008-12-06  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/38425
	* io.c (check_io_constraints): Check constraints on REC=, POS=, and
	internal unit with POS=. Fix punctuation on a few error messages.
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