Remove unneeded docker build arg

Author: jonas

bindgen/Dockerfile

@@ -1,7 +1,7 @@
 ARG UBUNTU_VERSION=18.04
 ARG LLVM_VERSION=6.0
 ARG BUILD_TAG=ubuntu-$UBUNTU_VERSION-llvm-$LLVM_VERSION
-FROM scalabindgen/scala-native-bindgen-builder:$BUILD_TAG as build
+FROM scalabindgen/scala-native-bindgen-builder:$BUILD_TAG as builder
 
 WORKDIR /src
 COPY . /src
@@ -16,13 +16,11 @@ FROM ubuntu:$UBUNTU_VERSION
 
 ARG LLVM_VERSION=6.0
 ENV LLVM_VERSION=$LLVM_VERSION
-# LLVM dev versions do not have a "-x.y" version suffix.
-ARG LLVM_DEB_COMPONENT=-$LLVM_VERSION
 RUN set -x \
  && apt update \
  && apt install -y --no-install-recommends libclang1-$LLVM_VERSION \
  && rm -rf /var/lib/apt/lists/*
 
-COPY --from=build /src/target/scala-native-bindgen /usr/bin/scala-native-bindgen
+COPY --from=builder /src/target/scala-native-bindgen /usr/bin/scala-native-bindgen
 WORKDIR /src
 ENTRYPOINT [scala-native-bindgen]