Use https://git.openjdk.java.net for CODE_TOOLS_URL in make/build-all.sh to allow for JTReg's dependencies to transition Git, GitHub and Skara if they want.
Furthermore, CODE_TOOLS_URL should be user configurable for those wishing to continue to use https://hg.openjdk.java.net/code-tools.
Furthermore, CODE_TOOLS_URL should be user configurable for those wishing to continue to use https://hg.openjdk.java.net/code-tools.