layers: Make validation error maps non-static

In order to address compile/runtime issues, the large validation tables
are now generated such that the declaration and implementation are
separate.

Change-Id: I3e9327e8d2c5427f2bfc93266cdfb8edc0339a12
diff --git a/layers/object_tracker_utils.cpp b/layers/object_tracker_utils.cpp
index 00bb264..d044bfd 100644
--- a/layers/object_tracker_utils.cpp
+++ b/layers/object_tracker_utils.cpp
@@ -20,6 +20,8 @@
  * Author: Tobin Ehlis <tobin@lunarg.com>
  */
 
+#define VALIDATION_ERROR_MAP_IMPL
+
 #include "object_tracker.h"
 
 namespace object_tracker {