fai/classes/S*.source executable check bugfix

[Ronan KERYELL]

>>>>> On Wed, 26 Jun 2002 10:54:06 +1000, Andrew Pollock <andrew-fai at andrew.net.au> said:

    Andrew> I think that comes down to a personal choice. I must admit
    Andrew> that I've been bitten in the past by source files that weren't
    Andrew> being sourced because they weren't executable,

Well, for me just right now with some issues about +x disappearing on some
files through CVS... :-(

    Andrew>  but I can see the benefit of being able to exclude them by
    Andrew> simply marking them non-executable rather than moving them out
    Andrew> of the directory or giving them a crypt .notsource name or
    Andrew> something.

A compromise could be to output a warning everytime a file is skipped
because it is not executable (for .source., .sh, scripts,...).
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