ncurses: support termlib

pkgs/development/libraries/ncurses/default.nix

···
 , enableStatic ? stdenv.hostPlatform.isStatic
 , withCxx ? !stdenv.hostPlatform.useAndroidPrebuilt
 , mouseSupport ? false, gpm
+, withTermlib ? false
 , unicodeSupport ? true
 , testers
 , binlore
···
     ++ lib.optional (!withCxx) "--without-cxx"
     ++ lib.optional (abiVersion == "5") "--with-abi-version=5"
     ++ lib.optional stdenv.hostPlatform.isNetBSD "--enable-rpath"
+    ++ lib.optional withTermlib "--with-termlib"
     ++ lib.optionals stdenv.hostPlatform.isWindows [
       "--enable-sp-funcs"
       "--enable-term-driver"