reset upstream subtrees to yocto 2.6

Reset the following subtrees on thud HEAD:

  poky: 87e3a9739d
  meta-openembedded: 6094ae18c8
  meta-security: 31dc4e7532
  meta-raspberrypi: a48743dc36
  meta-xilinx: c42016e2e6

Also re-apply backports that didn't make it into thud:
  poky:
    17726d0 systemd-systemctl-native: handle Install wildcards

  meta-openembedded:
    4321a5d libtinyxml2: update to 7.0.1
    042f0a3 libcereal: Add native and nativesdk classes
    e23284f libcereal: Allow empty package
    030e8d4 rsyslog: curl-less build with fmhttp PACKAGECONFIG
    179a1b9 gtest: update to 1.8.1

Squashed OpenBMC subtree compatibility updates:
  meta-aspeed:
    Brad Bishop (1):
          aspeed: add yocto 2.6 compatibility

  meta-ibm:
    Brad Bishop (1):
          ibm: prepare for yocto 2.6

  meta-ingrasys:
    Brad Bishop (1):
          ingrasys: set layer compatibility to yocto 2.6

  meta-openpower:
    Brad Bishop (1):
          openpower: set layer compatibility to yocto 2.6

  meta-phosphor:
    Brad Bishop (3):
          phosphor: set layer compatibility to thud
          phosphor: libgpg-error: drop patches
          phosphor: react to fitimage artifact rename

    Ed Tanous (4):
          Dropbear: upgrade options for latest upgrade
          yocto2.6: update openssl options
          busybox: remove upstream watchdog patch
          systemd: Rebase CONFIG_CGROUP_BPF patch

Change-Id: I7b1fe71cca880d0372a82d94b5fd785323e3a9e7
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/poky/meta/recipes-gnome/gtk-doc/files/pkg-config-native.patch b/poky/meta/recipes-gnome/gtk-doc/files/pkg-config-native.patch
index bfbc777..9b128e1 100644
--- a/poky/meta/recipes-gnome/gtk-doc/files/pkg-config-native.patch
+++ b/poky/meta/recipes-gnome/gtk-doc/files/pkg-config-native.patch
@@ -1,7 +1,7 @@
-From 5f145621b4780cfd6a5632fcc97c45f572938efc Mon Sep 17 00:00:00 2001
+From 04af15322f677db42ecc2acc465334a04de9a871 Mon Sep 17 00:00:00 2001
 From: Ross Burton <ross.burton@intel.com>
 Date: Mon, 5 Sep 2016 22:25:44 +0100
-Subject: [PATCH 5/5] Use native pkg-config when looking for gtk-doc.
+Subject: [PATCH] Use native pkg-config when looking for gtk-doc.
 
 Upstream-Status: Inappropriate
 Signed-off-by: Ross Burton <ross.burton@intel.com>
@@ -10,10 +10,10 @@
  gtk-doc.m4 | 7 ++++++-
  1 file changed, 6 insertions(+), 1 deletion(-)
 
-Index: gtk-doc-1.27/gtk-doc.m4
-===================================================================
---- gtk-doc-1.27.orig/gtk-doc.m4
-+++ gtk-doc-1.27/gtk-doc.m4
+diff --git a/gtk-doc.m4 b/gtk-doc.m4
+index 2d12f01..e5afc3f 100644
+--- a/buildsystems/autotools/gtk-doc.m4
++++ b/buildsystems/autotools/gtk-doc.m4
 @@ -25,7 +25,7 @@
  # Macro appear in them. The GNU General Public License (GPL) does govern
  # all other use of the material that constitutes the Autoconf Macro.