George Smith Alexander and Kiel Porter Bloomberg News - Minacs Ltd., an outsourcing company with a headquarters in Farmington Hills, has been put up for sale by its private-equity owners, people with knowledge of the matter said. Asian buyout firms Capital Square Partners and CX Partners are seeking a valuation of more than $500 million for Minacs, the people said, asking not to be identified as the information is private. Minacs has annual earnings before interest, taxes, depreciation and amortization, or Ebitda, of about $50 million to