[patch, fortran] PR35754 -std=f95: Reject "1P2E12.4" w/o a comma after the "P"

[Jerry DeLisle]

The attached patch fixes the diagnostics for the subject case and adds 
checks for the acceptable format specifiers after a P without a comma. I 
will be looking into the runtime side of these fixes after this is 
committed.

Regression tested on x86-64 Linux.  Test case included.

OK for trunk.

Note: The patch may be offset a bit since my trunk has the patch for 
37446 in it.

Regards,

Jerry

2009-08-23  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/35754
	* io.c (check_format): Add checks for comma and the allowed
	format specifiers after the 'P' specifier.
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