remove use_system_libwayland

We no longer support system libwayland in Chromium and that is going to
be removed from ANGLE. Thus, this can be removed.

Bug: chromium:1385736
Change-Id: I0746a4a4af70b774ebe7338efd83f4671a0d8469
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/70408
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Commit-Queue: Alexis Hétu <sugoi@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
diff --git a/build_overrides/wayland.gni b/build_overrides/wayland.gni
index 21e575c..e50b0fd 100644
--- a/build_overrides/wayland.gni
+++ b/build_overrides/wayland.gni
@@ -13,6 +13,6 @@
 # limitations under the License.
 
 ozone_platform_wayland = true
-use_system_libwayland = true
+
 # SwiftShader has no wayland third-party dir
 wayland_gn_dir = ""
diff --git a/src/WSI/BUILD.gn b/src/WSI/BUILD.gn
index c53a1c9..f2c7b0a 100644
--- a/src/WSI/BUILD.gn
+++ b/src/WSI/BUILD.gn
@@ -87,7 +87,7 @@
     "../Vulkan:swiftshader_libvulkan_headers",
   ]
 
-  if (is_linux && ozone_platform_wayland && !use_system_libwayland) {
+  if (is_linux && ozone_platform_wayland) {
     # Use third-party targets
     deps += [ "$wayland_gn_dir:wayland_client" ]
   }