Add a target to run the SyzyAsan RTL unittests in 4G

syzygy/agent/asan/shadow.h

Index: syzygy/agent/asan/shadow.h
diff --git a/syzygy/agent/asan/shadow.h b/syzygy/agent/asan/shadow.h
index 8288532e0b1badacaa5164c9d7d96484fbe0d4e4..4ba82175d42bc391114cf20ce27c25f19d545645 100644
--- a/syzygy/agent/asan/shadow.h
+++ b/syzygy/agent/asan/shadow.h
@@ -419,9 +419,7 @@ class ShadowWalker {
 };
 
 // The static shadow memory that is referred to by the memory interceptors.
-// These are provided by one of 'dummy_shadow.cc' or 'static_shadow.cc'.
 extern "C" {
-extern const size_t asan_memory_interceptors_shadow_memory_size;
 extern uint8_t asan_memory_interceptors_shadow_memory[];
 }