hspell: Add zlib

As mentioned by the configure script output, hspell will fall back
on using `gzip` program when not linked against `zlib`:

    No Zlib library, defaulting to using pipes

It has been removed in 67f0a21 for some reason.

Without this patch, Geary is stuck loading messages, even though I can interact
with the rest of its UI. I am also getting the following in the log so broken
piping might be breaking webkitgtk for some reason:

    Hspell: can't run gzip -dc '/nix/store/14qk9r9ywvpqn0a24fvw1iwjv302d04j-hspell-1.4/share/hspell/hebrew.wgz.prefixes'.
    Could not create GBM EGL display: EGL_NOT_INITIALIZED. Aborting...

And after quitting Geary:

    *[wrn] 18:29:13.0226 geary:application-client.vala:464: Forcing shutdown of Geary, 7s passed...
    gzip:
    gzip: stdout: Broken pipe
    stdout: Broken pipe

Co-authored-by: Colin <[email protected]>

pkgs/development/libraries/hspell/default.nix

@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
   patches = [ ./remove-shared-library-checks.patch ];
   postPatch = "patchShebangs .";
   preBuild = lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) ''
-    make CC=${buildPackages.stdenv.cc}/bin/cc find_sizes
+    make CC='${buildPackages.stdenv.cc}/bin/cc -I${lib.getDev buildPackages.zlib}/include -L${buildPackages.zlib}/lib' find_sizes
     mv find_sizes find_sizes_build
     make clean
 
@@ -41,7 +41,10 @@ stdenv.mkDerivation rec {
     perl
     zlib
   ];
-  buildInputs = [ perl ];
+  buildInputs = [
+    perl
+    zlib
+  ];
 
   strictDeps = true;