Fix public issue #29: Write CPU timing code for Windows, based on GetProcessTimes()

instead of getursage().

I thought I'd already committed this patch, so that the 1.0.1 release already
would have a Windows-compatible snappy_unittest, but I'd seemingly deleted it
instead, so this is a reconstruction.

R=csilvers
DELTA=43  (39 added, 3 deleted, 1 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=1295


git-svn-id: https://snappy.googlecode.com/svn/trunk@28 03e5f5b5-db94-4691-08a0-1a8bf15f6143

snappy-test.h

@@ -40,7 +40,10 @@
 #include <sys/mman.h>
 #endif
 
+#ifdef HAVE_SYS_RESOURCE_H
 #include <sys/resource.h>
+#endif
+
 #include <sys/time.h>
 
 #include <string>