Source: BY AMRUTHA PENUMUDI Pfizer Inc (PFE.N) is buying Anacor Pharmaceuticals Inc (ANAC.O) in a $5.2 billion deal to add an eczema gel to its portfolio, just a month after the U.S. drug major scrapped plans to acquire Allergan Plc (AGN.N). Anacor shares surged more than 55 percent to $99.48…...