xfce4-notes-plugin: remove

- inactive for a long time
- use old ABI from exo and libxfce4ui despite long transition period
- build broken with xfce4-4.16

srcpkgs/xfce4-notes-plugin/template

@@ -1,13 +0,0 @@
-# Template file for 'xfce4-notes-plugin'
-pkgname=xfce4-notes-plugin
-version=1.8.1
-revision=4
-build_style=gnu-configure
-hostmakedepends="pkg-config intltool"
-makedepends="xfce4-panel-devel libunique1-devel"
-short_desc="Notes plugin for the Xfce4 panel"
-maintainer="Alexander Mamay <alexander@mamay.su>"
-license="GPL-2.0-or-later"
-homepage="https://goodies.xfce.org/projects/panel-plugins/xfce4-notes-plugin"
-distfiles="https://archive.xfce.org/src/panel-plugins/${pkgname}/${version%.*}/${pkgname}-${version}.tar.bz2"
-checksum=07a4c3e71431c24f97d2e270452dd0fa51ff0bdb6219a13a20d0bfa8d9de54b2