Fix printing of NaClHandle values in sigpipe_test for Win64
Fix printing of NaClHandle values in sigpipe_test for Win64

This test prints the value of NaClHandles, which are void pointers on
Windows. Previously it was using %d to print them which is wrong on Win64,
and only MSVS 2013+ warns about it.

R=bradnelson@google.com, bradn
BUG=None

Review URL: https://codereview.chromium.org/284383002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@13196 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client