eutils.eclass: Deprecate validate_desktop_entries

The validate_desktop_entries function is redundant to the built-in
.desktop file checks done by Portage directly. It is used in total by
two packages for both of which bugs have been filed.

eclass/eutils.eclass

@@ -1,4 +1,4 @@
-# Copyright 1999-2015 Gentoo Foundation
+# Copyright 1999-2017 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: eutils.eclass
@@ -883,6 +883,9 @@ _eutils_eprefix_init() {
 # @DESCRIPTION:
 # Validate desktop entries using desktop-file-utils
 validate_desktop_entries() {
+ eqawarn "validate_desktop_entries is deprecated and should be not be used."
+ eqawarn ".desktop file validation is done implicitly by Portage now."
+
  _eutils_eprefix_init
  if [[ -x "${EPREFIX}"/usr/bin/desktop-file-validate ]] ; then
  einfo "Checking desktop entry validity"