Work around rpmbuild eagerness

rpmbuild looks for dependencies when building an RPM package. If a file has a shebang line, it'll add that as an explicit dependency. We've added awsbox to mozilla/butter, but the rpmbuild failed because /usr/bin/node doesn't exist on our servers, we build our own version of node. This patch simply removes the shebang so that we don't need to hack around it in butter.