berry: patch the version in the configure script

This fixes how berry internalizes its own version. By default a static 0.1.7 is
and overriden if a `.git` folder does exist. In that case `git describe` is used
and the version parsed out of it.

This PR unconditionally patches the version in the configure file as that appears
to be easier and more idiomatic than a "fake git".

pkgs/applications/window-managers/berry/default.nix

@@ -39,6 +39,10 @@ stdenv.mkDerivation rec {
     freetype
   ];
 
+  postPatch = ''
+    sed -i --regexp-extended 's/(pkg_verstr=").*(")/\1${version}\2/' configure
+  '';
+
   preConfigure = ''
     patchShebangs configure
   '';