RFA: (testsuite): make darwin as untested in bigcore.exp

[Tristan Gingold <gingold@adacore.com>]

Hi,

the darwin kernel isn't very good at generating core files.  In  
particular it lacks sparse corefile support.
This patch adjust the bigcore.exp testcase for Darwin.

Tristan.

gdb/testsuite:
2009-06-29  Tristan Gingold  <gingold@adacore.com>

	* gdb.base/bigcore.exp: Make darwin untested.

diff -c -p -r1.17 bigcore.exp
*** gdb/testsuite/gdb.base/bigcore.exp	3 Jan 2009 05:58:03 -0000	1.17
--- gdb/testsuite/gdb.base/bigcore.exp	29 Jun 2009 15:45:43 -0000
*************** if ![isnative] then {
*** 40,45 ****
--- 40,46 ----
   if { [istarget "*-*-*bsd*"]
        || [istarget "*-*-hpux*"]
        || [istarget "*-*-solaris*"]
+      || [istarget "*-*-darwin*"]
        || [istarget "*-*-cygwin*"] } {
       untested "Kernel lacks sparse corefile support (PR gdb/1551)"
       return