c-ares: fix android build

https://hydra.nixos.org/build/79244764

pkgs/development/libraries/c-ares/default.nix

···
     sha256 = "0vnwmbvymw677k780kpb6sb8i3szdp89rzy8mz1fwg1657yw3ls5";
   };
 
+  # ares_android.h header is missing
+  # see issue https://github.com/c-ares/c-ares/issues/216
+  postPatch = if stdenv.hostPlatform.isAndroid then ''
+    cp ${fetchurl {
+      url = "https://raw.githubusercontent.com/c-ares/c-ares/cares-1_14_0/ares_android.h";
+      sha256 = "1aw8y6r5c8zq6grjwf4mcm2jj35r5kgdklrp296214s1f1827ps8";
+    }} ares_android.h
+  '' else null;
+
   meta = with stdenv.lib; {
     description = "A C library for asynchronous DNS requests";
     homepage = https://c-ares.haxx.se;