Verified boot wrapper - add stub implementations for host

This is part 2 of the wrapper API refactor.  It adds stub
implementations for the host, and changes the host-side utilities to
use them.  Firmware implementation is unchanged in this CL (other than
a few updates to macros).

BUG=chromium_os:16997
TEST=make && make runtests

Change-Id: I63989bd11de1f2239ddae256beaccd31bfb5acef
Reviewed-on: http://gerrit.chromium.org/gerrit/3256
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Tested-by: Randall Spangler <rspangler@chromium.org>
diff --git a/host/lib/crossystem.c b/host/lib/crossystem.c
index 54d0856..72f2c66 100644
--- a/host/lib/crossystem.c
+++ b/host/lib/crossystem.c
@@ -298,7 +298,7 @@
       break;
   }
 
-  Free(sh);
+  free(sh);
   return value;
 }
 
@@ -333,7 +333,7 @@
       break;
   }
 
-  Free(sh);
+  free(sh);
   return value;
 }