OpenJ9 detection fails for certain builds of the VM

[Hubry]

Encountered in vectorwing/FarmersDelight#190, which seems to make the modded game crash because of a typetools bug.

https://github.com/cpw/modlauncher/blob/3cf110cd0b2a5bcd8a44057fd0513e38a4b06f97/src/main/java/cpw/mods/modlauncher/ValidateLibraries.java#L29

The builds used by these users, coming from AdoptOpenJDK seem to contain the string OpenJ9 in properties java.vm.name, java.vm.info and java.vm.vendor, but not the checked java.vendor (which is AdoptOpenJDK).

An answer to a question about detecting OpenJ9 on Adopt's github repo here seems to point at java.vm.name for this.

[sciwhiz12]

Fixed by #96, merged as 9b69c82.