[testsuite] Kfail signals.exp failures

[Mark Kettenis]

   Date: Tue, 24 Aug 2004 18:33:47 -0400
   From: Andrew Cagney <cagney@gnu.org>

   As for a separate signals directory, this code is really testing 
   infrun.c (ya), and makes for some fundamental functionality (should have 
   been fixed working 10+ years ago), so I think still belongs in gdb.base. 
     Besides I've been naming all the files sig*.exp so that they are easy 
   to identify.

   I think its better to reserve new directories for things that are 
   clearly separate -> stabs edge cases, dwarf edge cases, C++ lang stuff, 
   ...  We could too easily end up with a pedantic debate over which 
   directory a test belongs (...) :-)

I agree with Andrew here.