[Bug libfortran/62296] EXECUTE_COMMAND_LINE not F2008 conforming

[anlauf at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62296

--- Comment #4 from Harald Anlauf <anlauf at gmx dot de> ---
(In reply to Harald Anlauf from comment #3)
> One might be able to do better on any reasonable Unix/Linux system.

Replying to myself: Intel has changed/fixed their implementation of
EXECUTE_COMMAND_LINE in version 15.1, and it appears to work
reasonably now.