Rust-GPU: pin to 985007fc, until i can figure how to bump it

crates/spirv_backend_builder/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Colin <colin@uninsane.org>"]
 edition = "2021"
 
 [dependencies]
-spirv-builder = { git = "https://github.com/Rust-GPU/rust-gpu", features = ["use-compiled-tools"] }
+spirv-builder = { git = "https://github.com/Rust-GPU/rust-gpu", rev = "985007fc", features = ["use-compiled-tools"] }
 
 # these deps are to satisfy internal rustc stuff, since spirv-builder links into rustc internals (HACK).
 # this needs to match the rustc lock file -- not just its Cargo.toml -- so we pin down to the patch level