aerc: add dependency on ncurses for unknown terminals

The TUI library aerc uses, tcell, comes with a built-in database of
terminal definitions.  For terminals not in this database (e.g.
Alacritty), an entry is generated dynamically using infocmp, part of
ncurses' dev output.

pkgs/applications/networking/mailreaders/aerc/default.nix

@@ -1,5 +1,5 @@
 { stdenv, buildGoModule, fetchurl
-, go, scdoc
+, go, ncurses, scdoc
 , python3, perl, w3m, dante
 }:
 
@@ -38,7 +38,8 @@ buildGoModule rec {
   '';
 
   postFixup = ''
-    wrapProgram $out/bin/aerc --prefix PATH ":" "$out/share/aerc/filters"
+    wrapProgram $out/bin/aerc --prefix PATH ":" \
+      "$out/share/aerc/filters:${stdenv.lib.makeBinPath [ ncurses.dev ]}"
     wrapProgram $out/share/aerc/filters/html --prefix PATH ":" \
       ${stdenv.lib.makeBinPath [ w3m dante ]}
   '';