nixBuild: Respect the preHook/postHook of the caller

pkgs/build-support/release/nix-build.nix

@@ -18,6 +18,8 @@
 , prePhases ? []
 , postPhases ? []
 , buildInputs ? []
+, preHook ? ""
+, postHook ? ""
 , ... } @ args:
 
 let
@@ -90,6 +92,7 @@ stdenv.mkDerivation (
       . ${./functions.sh}
       origSrc=$src
       src=$(findTarball $src)
+      ${postHook}
     '';
 
     preHook = ''
@@ -105,6 +108,8 @@ stdenv.mkDerivation (
         shopt -s expand_aliases
         alias make="scan-build -o _clang_analyze_$name --html-title='Scan results for $name' make"
       fi
+
+      ${preHook}
     '';
 
     # Clean up after analysis