nodejs: fix impure configure phase

When running configurePhase from impure build environment (i.e. nix
develop), default ./configure script was selecting wrong, impure Python
installation.
https://github.com/nodejs/node/blob/d57af10d1be390f4e33e6efe596133de9da36c86/configure#L7-L15

pkgs/development/web/nodejs/nodejs.nix

@@ -60,8 +60,6 @@ let
       NIX_CFLAGS_COMPILE = "-D__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__=101300";
     };
 
-    CC_host = "cc";
-    CXX_host = "c++";
     depsBuildBuild = [ buildPackages.stdenv.cc openssl libuv zlib icu ];
 
     # NB: technically, we do not need bash in build inputs since all scripts are
@@ -106,6 +104,11 @@ let
 
     dontDisableStatic = true;
 
+    configureScript = writeScript "nodejs-configure" ''
+      export CC_host="$CC_FOR_BUILD" CXX_host="$CXX_FOR_BUILD"
+      exec ${python.executable} configure.py "$@"
+    '';
+
     enableParallelBuilding = true;
 
     # Don't allow enabling content addressed conversion as `nodejs`