RALEIGH — A decade ago, North Carolina Republicans redrew their legislative districts to help their party in a way that a federal court ruled illegally deprived black voters of their right to political representation. A partisan state court later struck down Republican-drawn maps as based on pure partisanship.  As the once-a-decade redistricting process kicks into high gear, North Carolina is one of at least three states where Republicans say they are drawing maps without looking at racial and party data. Democrats are incredulous, noting that veteran lawmakers don’t need a spreadsheet to know where voters of various races and different…