Retain --enable-library-coverage

The option has the same effect as --enable-coverage, but we retain it
for backwards compatibility.

Cabal/Distribution/Simple/Setup.hs

@@ -575,16 +575,16 @@ configureOptions showOrParseArgs =
          configTests (\v flags -> flags { configTests = v })
          (boolOpt [] [])
 
-      ,option "" ["library-coverage"]
-         "OBSOLETE. Please use --enable-coverage instead."
-         configLibCoverage (\v flags -> flags { configLibCoverage = v })
-         (boolOpt [] [])
-
       ,option "" ["coverage"]
-         "build package with Haskell Program Coverage enabled. (GHC only)"
+         "build package with Haskell Program Coverage. (GHC only)"
          configCoverage (\v flags -> flags { configCoverage = v })
          (boolOpt [] [])
 
+      ,option "" ["library-coverage"]
+         "build package with Haskell Program Coverage. (GHC only) (OBSOLETE)"
+         configLibCoverage (\v flags -> flags { configLibCoverage = v })
+         (boolOpt [] [])
+
       ,option "" ["exact-configuration"]
          "All direct dependencies and flags are provided on the command line."
          configExactConfiguration