maint.mk: sc_po_check misses out on translated shell scripts

[Eric Blake]

Libvirt just got false negatives during 'make syntax-check' on a patch
that added shell script translations to libvirt-guests.init.in (the
version-controlled source file that gets converted into an init script),
because sc_po_check complained that the file shouldn't have been listed
in POTFILES.in.  This is because shell script translations don't use
_().  Rather, they can be recognized by the presence of sourcing
gettext.sh then using 'gettext "string"' or 'eval_gettext "string"'.

I worked around it in libvirt by adding a dummy shell comment with _(),
because I wasn't quite sure how to patch sc_po_check to use a better
regex that would recognize the use of gettext.sh in a shell script.  But
I'm hoping that someone else can help come up with a way to make the
syntax-check rule be smarter about translated shell scripts.

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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