Pershing Square Holdings, Ltd. last week reached an agreement in principle, subject to court approval, to settle lawsuits concerning the attempted acquisition of Allergan plc. by Pershing Square Capital Management, L.P. and Valeant Pharmaceuticals International, Inc. in 2014, which were filed in the Central District of California (Anthony Basile et al v. Valeant Pharmaceuticals International, Inc. et al.…