Fix copy paste mistake in error msg

Cabal/Distribution/Simple/Configure.hs

@@ -1887,10 +1887,10 @@ checkForeignLibSupported comp platform flib = go (compilerFlavor comp)
     goGhcLinux :: ForeignLibType -> Maybe String
     goGhcLinux ForeignLibNativeShared
       | standalone = unsupported [
-            "We cannot build standalone libraries on OSX"
+            "We cannot build standalone libraries on Linux"
           ]
       | not (null (foreignLibModDefFile flib)) = unsupported [
-            "Module definition file not supported on OSX"
+            "Module definition file not supported on Linux"
           ]
       | otherwise =
           Nothing