Add multiply support to <1.14

[Deftu]

After some digging, I've found that mul does exist in the older versions. Not sure as to why it was commented out here, please let me know if I'm mistaken here.

[Johni0702]

Not sure as to why it was commented out here, please let me know if I'm mistaken here.

Did you actually test this? IntelliJ is telling me that that's not a thing in lwjgl_util 2.9.4, and I don't see it looking at Matrix4f's source either (and CI seems to agree):

[Deftu]

Not sure as to why it was commented out here, please let me know if I'm mistaken here.

Did you actually test this? IntelliJ is telling me that that's not a thing in lwjgl_util 2.9.4, and I don't see it looking at Matrix4f's source either (and CI seems to agree):

Yes, I tested it in another project and the method existed.

[Johni0702]

But.. it doesn't? CI is failing and there's no hint of it even on the master branch of lwjgl2.

[Deftu]

Yes, I can see that. I'm more confused by the fact that when I used it in the other project, not only did IntelliSense report that the method existed, but it also compiled and ran in Minecraft 1.8.9 and 1.12.2.