Remove out-of-date release script

release.sh

-if [ ! -f artifacts-linux.zip ]; then
-    echo "Missing artifacts-linux.zip"
-    exit 1
-fi 
-if [ ! -f artifacts-osx.zip ]; then
-    echo "Missing artifacts-osx.zip"
-    exit 1
-fi 
-echo "version to tag:"
-read version
-rm -rf /tmp/build
-unzip artifacts-linux.zip -d /tmp/build/
-tar c -C /tmp/build bin | pixz -9 -o atbuild-${version}-linux.tar.xz
-rm -rf /tmp/build
-mkdir -p /tmp/build
-unzip artifacts-osx.zip -d /tmp/build/
-tar c -C /tmp/build bin | pixz -9 -o atbuild-${version}-macosx.tar.xz
\ No newline at end of file