kills an artifact of a merge conflict

this code shall not be here

Author: ivg

plugins/bap/utils/bap_taint.py

@@ -166,11 +166,3 @@ def install_callback(cls, callback_fn, ptr_or_reg=None):
         else:
             idc.Fatal("Invalid ptr_or_reg value passed {}".
                       format(repr(ptr_or_reg)))
-
-
-class BapTaintStub(DoNothing):
-    pass
-
-
-def PLUGIN_ENTRY():
-    return BapTaintStub()