ffcast: remove unnecessary DESTDIR=$out

This avoids files being installed to $out/nix/store

Changed files
+1 -1
pkgs
tools
X11
ffcast
+1 -1
pkgs/tools/X11/ffcast/default.nix
···
configureFlags = [ "--disable-xrectsel" ];
postBuild = ''
-
make DESTDIR="$out" install
+
make install
'';
meta = with stdenv.lib; {