Fix chromium build.

Add the missing dependency from WSI -> System.

Bug: b/146051794
Change-Id: I15a48f37d764c339c8c032589625b6d173df76b9
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40974
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Ben Clayton <bclayton@google.com>

src/WSI/BUILD.gn

diff --git a/src/WSI/BUILD.gn b/src/WSI/BUILD.gn
index a7233db..f1feb31 100644
--- a/src/WSI/BUILD.gn
+++ b/src/WSI/BUILD.gn
@@ -59,6 +59,7 @@
 
   deps = [
     "../../third_party/marl:Marl_headers",
+    "../System",
     "../Vulkan:swiftshader_libvulkan_headers",
   ]