message: build: remove simd-accel feature
  This feature is no longer used, instead we rely on runtime CPU feature
  detection. We kept the feature around as a no-op for backwards
  compatibility, but no longer need to support it for regex 1.0.
diff: @@ -54,9 +54,6 @@ unstable = ["pattern"]
  # Enable to use the unstable pattern traits defined in std. This is enabled
  # by default if the unstable feature is enabled.
  pattern = []
  -# Enable to use simd acceleration.
  -# Note that this is deprecated and is a no-op.
  -simd-accel = []
  [lib]
  # There are no benchmarks in the library code itself
  