Dual wielding as we are talking about does not predate Drizzt.I don't think Drizzt was the reason we have dual weapon rangers. As mentioned by Bacon Bits, the ranger originally was also meant to capture mountain men, Dacy Crockett, and indigenous native american archetypes as well (setting aside the cultural appropriation aspect, this was the early 80s after all). And those archetypes had tomahawk and knife pairing as a common style of melee combat. Looking at the timelines of when we saw dual weapon fighting with rangers in the 1e books, and knowing the appendix N as you will for rangers, it's eems clear dual weapons predates Drizzt
Dual wielding the tomahawk (hand axe) and knife (dagger) in the offhand do predate Drizzt and they are available in 1E for every character class except Cleric (who could not wield daggers or axes). They are not Ranger specific and were most often depicted on thieves and fighters in both the novels and sourcebooks. This is not dual wielding as I am speaking of it, we are talking about 2 of any one handed weapons (two swords, two maces, a sword and a hammer), which started for Rangers in 2E.
No class, including Rangers, could dual wield anything other than hand axes and daggers in the offhand. This was the case up until 2E and as noted above Drizzt, dual wielding scimitars, was published in a 1E sourcebook.