Remove glam

Unfortunately SIMD types are not FFI safe, see
rust-lang/rust#53346

Author: Jake-Shadle

physx-sys/Cargo.toml

@@ -50,9 +50,6 @@ debug-structs = []
 [dependencies]
 # The PhysX API exposes several enums used as flags
 bitflags = "1.3"
-# Glam's vector types match the alignment, layout, and size of the core scalar
-# types present in Physx's public API
-glam = "0.23"
 
 [build-dependencies]
 cc = { version = "1.0", features = ["parallel"] }