core: use numeric client version check

api/tbc.lua

@@ -1,4 +1,4 @@
-if GetBuildInfo() ~= "2.4.3" then return end
+if pfUI.client < 20000 then return end
 
 message("TBC compat module loaded. Good Luck!")
 

pfUI.lua

@@ -47,6 +47,9 @@ pfUI.version = {}
 pfUI.hooks = {}
 pfUI.env = {}
 
+local _, _, _, client = GetBuildInfo()
+pfUI.client = client or 11200
+
 -- setup pfUI namespace
 setmetatable(pfUI.env, {__index = getfenv(0)})