Update generator to latest rustc
Update generator to latest rustc

bjz/gl-rs,tomaka/gl-rs,tomaka/gl-rs,jimarnold/gl-rs,nicokoch/gl-rs,jimarnold/gl-rs,bjz/gl-rs,skligys/gl-rs,nicokoch/gl-rs,neon64/gl-rs,skligys/gl-rs,neon64/gl-rs