Drop vanilla GetItemInfo shim for C_Item.GetItemInfo

The compat/vanilla.lua GetItemInfo override reshaped vanilla's tuple into
retail order by inserting nil at slot 4 (itemLevel), but truncated at 8
fields, dropping itemEquipLoc/itemTexture. ClassicAPI's global GetItemInfo
keeps the vanilla shape (its hook only warms the item cache), so the shim
stayed necessary but incomplete.

Remove it and point the three callers at ClassicAPI's C_Item.GetItemInfo,
which returns the full 18-field retail tuple. Positions 1-8 are identical
to the old shim output, so bags/roll are unchanged; character.lua's
itemSlot (equipLoc, field 9) was always nil under the truncating shim and
now resolves correctly for ShaguScore.

compat/vanilla.lua

@@ -29,15 +29,6 @@ UNITFRAME_SECURE_TEMPLATE = nil
 
 --[[ Vanilla API Extensions ]]--
 
-do -- GetItemInfo
-  local name, link, rarity, minlevel, itype, isubtype, stack
-  function GetItemInfo(item)
-    if not item then return end
-    name, link, rarity, minlevel, itype, isubtype, stack = _G.GetItemInfo(item)
-    return name, link, rarity, nil, minlevel, itype, isubtype, stack
-  end
-end
-
 do -- RunMacroText
   local obj = { ["GetText"] = function(self) return self.text end }
   obj = setmetatable(obj, {__index = function(tab,key)

modules/bags.lua

@@ -448,7 +448,7 @@ pfUI:RegisterModule("bags", function ()
       end
     end
 
-    local _, _, q, _, _, _, itype = GetItemInfo(itemID)
+    local _, _, q, _, _, _, itype = C_Item.GetItemInfo(itemID)
 
     -- running advanced item color scan
     if C.appearance.bags.borderonlygear == "0" and texture and quality and quality < 1 then

modules/roll.lua

@@ -42,7 +42,7 @@ pfUI:RegisterModule("roll", function ()
     end
 
     local _, _, itemLink = string.find(hyperlink, "(item:%d+:%d+:%d+:%d+)")
-    local itemName = GetItemInfo(itemLink)
+    local itemName = C_Item.GetItemInfo(itemLink)
 
     -- delete obsolete tables
     if pfUI.roll.cache[itemName] and pfUI.roll.cache[itemName]["TIMESTAMP"] < GetTime() - 60 then

skins/blizzard/character.lua

@@ -131,7 +131,7 @@ pfUI:RegisterSkin("Character", function ()
 
         if ShaguScore and itemID then
           local itemLevel = C_Item.GetCurrentItemLevel({ equipmentSlotIndex = slotId })
-          local _, _, quality, _, _, _, _, _, itemSlot, _ = GetItemInfo(itemID)
+          local _, _, quality, _, _, _, _, _, itemSlot, _ = C_Item.GetItemInfo(itemID)
           local score = ShaguScore:Calculate(itemSlot, quality, itemLevel)
           if score and score > 0 and quality and quality > 0 then
             local r,g,b = GetItemQualityColor(quality)