Fix library includes for 1.5.
Fix library includes for 1.5.

I guess this wasn't an issue until I tried to use one with the packet stuff.

GuntherDW/inventory-tweaks-liteloader,mrammy/inventory-tweaks,14mRh4X0r/inventory-tweaks,asiekierka/inventory-tweaks,PrinceOfAmber/inventory-tweaks,TGNThump/inventory-tweaks,GuntherDW/inventory-tweaks-liteloader,Vexatos/inventory-tweaks,TerraGamingNetwork/inventory-tweaks,Vexatos/inventory-tweaks,Kobata/inventory-tweaks,asiekierka/inventory-tweaks,14mRh4X0r/inventory-tweaks,PrinceOfAmber/inventory-tweaks,TerraGamingNetwork/inventory-tweaks,TGNThump/inventory-tweaks,mrammy/inventory-tweaks