[patch, libgfortran] Fix PR59108 ACTION='READ' is using O_CREAT

[Jerry DeLisle]

The attached patch sets the create flag for the case where action is specified
as read only.

I have confirmed that the PR test case now only produces:

open("wombat", O_RDONLY)                = 3
open("numbat", O_RDONLY)                = 4
open("dingbat", O_RDONLY)               = 5
+++ exited with 0 +++

I can not think of a test case for this.

Regression tested on x86-64 Linux.

OK for trunk?

Regards,

Jerry

2013-11-15  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/59108
	* io/unix.c (regular_file): If the ACTION is read only set
	create flag to zero.

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