gnome-system-monitor: re-add 3.26.0

3.28.0 fails for glib-2.0 version:
| configure: error: Package requirements (glib-2.0 >= 2.55.0

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-gnome/recipes-gnome/gnome-system-monitor/files/0001-help-remove-YELP-macro.patch

@@ -0,0 +1,28 @@
+From 4a3ee8b46d25b3d310448bfa4446e15a686fc685 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Andreas=20M=C3=BCller?= <schnitzeltony@gmail.com>
+Date: Fri, 23 Mar 2018 13:50:18 +0100
+Subject: [PATCH] help: remove YELP macro
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Upstream-Status: Inappropriate [embedded-specific]
+
+Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>
+---
+ help/Makefile.am | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/help/Makefile.am b/help/Makefile.am
+index c5cd0d3..4b83adf 100644
+--- a/help/Makefile.am
++++ b/help/Makefile.am
+@@ -1,5 +1,3 @@
+-@YELP_HELP_RULES@
+-
+ HELP_ID = gnome-system-monitor
+ 
+ HELP_FILES = \
+-- 
+2.14.3
+

meta-gnome/recipes-gnome/gnome-system-monitor/gnome-system-monitor_3.26.0.bb

@@ -0,0 +1,32 @@
+SUMMARY = "Gnome system monitor"
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://COPYING;md5=751419260aa954499f7abaabaa882bbe"
+
+DEPENDS = " \
+    intltool-native \
+    gnome-common-native \
+    glib-2.0-native \
+    gtkmm3 \
+    libgtop \
+    librsvg \
+    libwnck3 \
+"
+
+inherit gnomebase
+
+SRC_URI[archive.md5sum] = "fcd59867c07f8c4853b1e28d60cbc037"
+SRC_URI[archive.sha256sum] = "f848a8c2ca5e164cf09d3a205dd49e4e4bf4b60d43b0969c10443eb519d0e6b3"
+SRC_URI += "file://0001-help-remove-YELP-macro.patch"
+
+RRECOMMENDS_${PN} = "adwaita-icon-theme"
+
+FILES_${PN} += " \
+    ${datadir}/icons \
+    ${datadir}/dbus-1 \
+    ${datadir}/gnome/autostart \
+"
+
+FILES_${PN}-doc += " \
+    ${datadir}/omf \
+    ${datadir}/gnome/help \
+"