corefonts: use installFonts

pkgs/by-name/co/corefonts/package.nix

@@ -3,6 +3,7 @@
   stdenv,
   fetchurl,
   cabextract,
+  installFonts,
 }:
 
 let
@@ -76,7 +77,10 @@ stdenv.mkDerivation {
     ) fonts
   );
 
-  nativeBuildInputs = [ cabextract ];
+  nativeBuildInputs = [
+    cabextract
+    installFonts
+  ];
 
   buildCommand = ''
     for i in $exes; do
@@ -124,7 +128,9 @@ stdenv.mkDerivation {
     mv webdings.ttf  Webdings.ttf.tmp
     mv Webdings.ttf.tmp  Webdings.ttf
 
-    install -m444 -Dt $out/share/fonts/truetype *.ttf
+    # using buildCommand means no phases are run
+    # so we run the function ourselves
+    installFonts
 
     # Also put the EULA there to be on the safe side.
     cp ${eula} $out/share/fonts/truetype/eula.html