doulos-sil: use installFonts (#517548)

pkgs/by-name/do/doulos-sil/package.nix

@@ -2,21 +2,28 @@
   lib,
   stdenvNoCC,
   fetchzip,
+  installFonts,
 }:
 
 stdenvNoCC.mkDerivation rec {
   pname = "doulos-sil";
   version = "7.000";
 
+  outputs = [
+    "out"
+    "webfont"
+  ];
+
   src = fetchzip {
     url = "https://software.sil.org/downloads/r/doulos/DoulosSIL-${version}.zip";
     hash = "sha256-i2M7YVBiLWUZETAZEesHdyQypoO5fbWHqhpizqVLB5E=";
   };
 
+  nativeBuildInputs = [ installFonts ];
+
   installPhase = ''
     runHook preInstall
 
-    install -Dm644 *.ttf -t $out/share/fonts/truetype
     install -Dm644 OFL.txt OFL-FAQ.txt README.txt FONTLOG.txt -t $out/share/doc/${pname}-${version}
 
     runHook postInstall