mupdf: only build and install shared libraries

pkgs/applications/misc/mupdf/default.nix

···
 { stdenv
 , lib
 , fetchurl
-, fetchpatch
 , fetchFromGitHub
 , copyDesktopItems
 , makeDesktopItem
···
     substituteInPlace Makerules --replace "(shell pkg-config" "(shell $PKG_CONFIG"
   '';
 
-  # Use shared libraries to decrease size
-  buildFlags = [ "shared" ];
-
   makeFlags = [
     "prefix=$(out)"
+    "shared=yes"
     "USE_SYSTEM_LIBS=yes"
     "PKG_CONFIG=${buildPackages.pkg-config}/bin/${buildPackages.pkg-config.targetPrefix}pkg-config"
   ] ++ lib.optionals (!enableX11) [ "HAVE_X11=no" ]
···
     Name: mupdf
     Description: Library for rendering PDF documents
     Version: ${version}
-    Libs: -L$out/lib -lmupdf -lmupdf-third
+    Libs: -L$out/lib -lmupdf
     Cflags: -I$dev/include
     EOF