[PATCH] adjust showfiles.c to new signal semantic

Hi,

this patch adjusts the test program (showfiles.c) to the new signal 
semantic that is used by dazukofs.
Without this the program may not be interruptable by SIGINT, SIGTERM and 
SIGHUP
(depending on the underlaying signal() call implementation).

It simply removes the unportable signal() with the portable sigaction() 
function.
It applies against dazukofs-3.1.4-rc3.

Regards,
Lino

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diff -Nurp dazukofs-3.1.4-rc3/test/showfiles.c dazukofs-3.1.4-rc3-PATCH1/test/showfiles.c
--- dazukofs-3.1.4-rc3/test/showfiles.c	2008-10-25 00:08:30.000000000 +0200
+++ dazukofs-3.1.4-rc3-PATCH1/test/showfiles.c	2010-11-12 13:26:26.000000000 +0100
 <at>  <at>  -25,7 +25,7  <at>  <at>