Fix procing off of unattackable things

This /might/ be a little restrictive, but it should prevent easy
farming of bone chips from Boneshear etc

changelog.txt

@@ -2,6 +2,7 @@ EQEMu Changelog (Started on Sept 24, 2003 15:50)
 -------------------------------------------------------
 == 12/03/2013 ==
 demonstar55: Added #showspellslist to view a mobs spell list
+demonstar55: Fix procing off of unattackable things
 
 == 12/02/2013 ==
 JJ: Bandaid fix to CopyCharacter function.

zone/attack.cpp

@@ -3844,6 +3844,11 @@ void Mob::TryWeaponProc(const ItemInst* weapon_g, Mob *on, uint16 hand) {
 		return;
 	}
 
+	if (!IsAttackAllowed(on)) {
+		mlog(COMBAT__PROCS, "Preventing procing off of unattackable things.");
+		return;
+	}
+
 	if(!weapon_g) {
 		TryWeaponProc(nullptr, (const Item_Struct*)nullptr, on, hand);
 		return;