Fix release build of viewer with Vulkan

Change-Id: I26c7b6030bb6be7e5005a05c593d1de40dda88db
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/299859
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 50edcdb..36f7e10 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2430,7 +2430,13 @@
         sources += [ "gm/xform.cpp" ]
       }
       if (skia_use_vulkan) {
-        deps += [ "//third_party/spirv-tools:spvtools" ]
+        deps += [
+          "//third_party/spirv-tools:spvtools",
+
+          #spvtools depends on this but doesn't deps it in. Looks like upstream bug
+          #that we replicated in our third_party/spirv-tools/BUILD.gn
+          "//third_party/spirv-tools:spvtools_val",
+        ]
       }
     }
   }