Turn the coverage analysis stdenv adapters into setup hooks

Stdenv adapters are kinda weird and un-idiomatic (especially when they
don't actually change stdenv).  It's more idiomatic to say

  buildInputs = [ makeCoverageAnalysisReport ];

pkgs/build-support/release/default.nix

@@ -27,7 +27,7 @@ rec {
     } // args);
 
   coverageAnalysis = args: nixBuild (
-    { inherit lcov;
+    { inherit lcov enableCoverageInstrumentation makeCoverageAnalysisReport;
       doCoverageAnalysis = true;
     } // args);