There is a lot of redundancy between NewMakefile.gmk and common/makefiles/Makefile. These need to be merged.

This has been done in build-infra.

* The bridgebuild and jprt specific stuff was moved to a separate file common/makefiles/Jprt.gmk.
* Default targets changed a bit. Default is basically what it was "jdk". There is a new "all" target which behaves differently depending on if closed is present. Currently it builds everything including deploy if closed is present. Will move to install when we have full support for it. For both open and closed it also builds docs.
* Made custom-hook.m4 less picky with --with-java-devtools option. Use it as a default rather than fail when something isn't found using it. This makes it more usable with bridgebuild.