knot-dns: Remove unnecessary runtime dependencies

Closure size: 261 -> 171 MiB.  (Only .bin was affected.)

pkgs/servers/dns/knot-dns/default.nix

@@ -26,6 +26,7 @@ stdenv.mkDerivation rec {
     # Don't try to create directories like /var/lib/knot at build time.
     # They are later created from NixOS itself.
     ./dont-create-run-time-dirs.patch
+    ./runtime-deps.patch
   ];
 
   nativeBuildInputs = [ pkgconfig autoreconfHook ];

pkgs/servers/dns/knot-dns/runtime-deps.patch

@@ -0,0 +1,14 @@
+Remove unnecessary runtime dependencies.
+
+`knotc status configure` shows summary from the configure script,
+but that contains also references like include paths.
+Filter these at least in a crude way (whole lines).
+--- a/configure.ac
++++ b/configure.ac
+@@ -766,5 +766,5 @@ result_msg_base="  Knot DNS $VERSION
+ 
+-result_msg_esc=$(echo -n "$result_msg_base" | sed '$!s/$/\\n/' | tr -d '\n')
++result_msg_esc=$(echo -n "$result_msg_base" | grep -Fv "$NIX_STORE" | sed '$!s/$/\\n/' | tr -d '\n')
+ 
+ AC_DEFINE_UNQUOTED([CONFIGURE_SUMMARY],["$result_msg_esc"],[Configure summary])
+