Detect openjdks

[akuhtz]

This PR allows to detect the following OpenJDKs installation from the Windows registry:

• Amazon Coretto
• AdoptOpenJDK
• Liberica

I assume this makes #7 redundant.

Anyway, this is nice, and hopefully will be merged soon. It seems like this issue affects heaps of users.
Personally I think falling back to %JAVA_HOME% would be better, but if this isn't the direction the project wants to go in this PR seems to also be good.

Hello, is there any compiled version of this PR or any ideas if this would be embedded?
Thank you

@teras Which OS do you use for the build?

I'm sure there's many people who would appreciate 32/64 bit, Windows 10 / Server 2016 / Server 2019 builds.

EDIT

@akuhtz I am using Linux & OSX, mainly OSX.

Just to give some feedback, I've set up our builds with this patch and everything seems to work as expected. Testing has been done with Java 8 and 11.

Is this going to be released any time soon?

just respect JAVA_HOME environment variable please...