openjdk: jigsaw m2 fixes, build zero to have a working build

	* download hotspot src used to build zero
	* openjdk-no-sa-jar.patch : zero do not build sa-jdi.jar
	  patch prevents build to try unpack and generate javadoc for it.
	* jigsaw m2 uses jdk, jre, jre-compact1, jre-compact2, jre-compact3
	  image names, fix target install to copy these directorys.
	* add CONF=linux-arm-normal-zero-release to make to fix rebuilds using
	  different configuration.
	* Let buildroot use --with-tools-dir=$(HOST_DIR) to make the build work
	  for other users.

Signed-off-by: Xerxes Rånby <xerxes@gudinna.com>