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You can't target an enemy unit engaged in combat, but with the doom diver it says you may roll a D6 and move that many inches in any direction. It doesn't state that with restrictions, and you're not exactly targeting anyone, just moving that many inches in any direction, a direction that happens to end up on an enemy unit engaged in combat.

Or would the glide be considered a type of target which goes against war machines targeting enemy units engaged in combat?

Your initial target point is exactly that; your target. As long as you follow the Stone Thrower rules for targeting, you are fine. Redirecting the Doom Diver into combat is no different that a Stone Thrower scattering into combat, aka perfectly legal.

I don't have books with me but I THINK "target" is only the initial point you choose. After that there are no restrictions on any war machine.

Thats my understanding as well. The doomdiver correction does not result in the unit hit (if any) becoming the "target" of the attack.