[Fuchsia] Remove unnecessary libs

Zircon gets pulled in automatically, removing it doesn't trigger any rebuild.

Change-Id: I84116dfbac30524d14501731e7bae5cff048fdde
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/Vulkan-Loader/+/429794
Reviewed-by: John Bauman <jbauman@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 34263c8..dbd9736 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -164,8 +164,6 @@
         "//sdk/lib/fdio",
       ]
 
-      libs = [ "zircon" ]
-
       runtime_deps = [ "//sdk/lib/fdio:fdio_sdk" ]
     }
   }