Prevent double-patching with GIT_CRATES usage.
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -86,6 +86 @@
 
-[patch.crates-io]
-# These are needed because https://github.com/gfx-rs/wgpu/pull/4778
-# is not yet in the latest wgpu release. TODO: Remove when it is.
-wgpu = { git = "https://github.com/gfx-rs/wgpu", branch = "v0.18" }
-naga = { git = "https://github.com/gfx-rs/wgpu", branch = "v0.18" }