Re-order Docker PATH to system clang is used before Swift toolchain clang

Author: marcprux

swift-ci/sdks/android/Dockerfile

@@ -54,7 +54,8 @@ ENV SWIFT_SIGNING_KEY=$SWIFT_SIGNING_KEY \
 COPY scripts/install-swift.sh /scripts/install-swift.sh
 RUN chmod ugo+x /scripts/install-swift.sh
 RUN /scripts/install-swift.sh /usr/local/swift
-ENV PATH="/usr/local/swift/bin:${PATH}"
+#ENV PATH="/usr/local/swift/bin:${PATH}"
+ENV PATH="${PATH}:/usr/local/swift/bin"
 
 ARG ANDROID_NDK_VERSION=