googleearth-pro: fix build (#420805)

pkgs/applications/misc/googleearth-pro/default.nix

@@ -37,6 +37,14 @@ let
       "amd64"
     else
       throw "Unsupported system ${stdenv.hostPlatform.system} ";
+
+  libxml2' = libxml2.overrideAttrs rec {
+    version = "2.13.8";
+    src = fetchurl {
+      url = "mirror://gnome/sources/libxml2/${lib.versions.majorMinor version}/libxml2-${version}.tar.xz";
+      hash = "sha256-J3KUyzMRmrcbK8gfL0Rem8lDW4k60VuyzSsOhZoO6Eo=";
+    };
+  };
 in
 mkDerivation rec {
   pname = "googleearth-pro";
@@ -70,7 +78,7 @@ mkDerivation rec {
     libXrender
     libproxy
     libxcb
-    libxml2
+    libxml2'
     sqlite
     zlib
     alsa-lib
@@ -81,9 +89,13 @@ mkDerivation rec {
   dontBuild = true;
 
   unpackPhase = ''
+    runHook preUnpack
+
     # deb file contains a setuid binary, so 'dpkg -x' doesn't work here
     mkdir deb
     dpkg --fsys-tarfile $src | tar --extract -C deb
+
+    runHook postUnpack
   '';
 
   installPhase = ''