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-devtools/meson/meson/0001-Support-building-allarch-recipes-again.patch b/poky/meta/recipes-devtools/meson/meson/0001-Support-building-allarch-recipes-again.patch
new file mode 100644
index 0000000..f6dd230
--- /dev/null
+++ b/poky/meta/recipes-devtools/meson/meson/0001-Support-building-allarch-recipes-again.patch
@@ -0,0 +1,28 @@
+From d80d02a3ca6e21fa3d055c88c05234c2eb4db128 Mon Sep 17 00:00:00 2001
+From: Peter Kjellerstedt <pkj@axis.com>
+Date: Thu, 26 Jul 2018 16:32:49 +0200
+Subject: [PATCH] Support building allarch recipes again
+
+This registers "allarch" as a known CPU family.
+
+Upstream-Status: Inappropriate [OE specific]
+Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
+---
+ mesonbuild/environment.py | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/mesonbuild/environment.py b/mesonbuild/environment.py
+index a0580a2..712b1e8 100644
+--- a/mesonbuild/environment.py
++++ b/mesonbuild/environment.py
+@@ -73,6 +73,7 @@ from .compilers import (
+ build_filename = 'meson.build'
+ 
+ known_cpu_families = (
++    'allarch',
+     'aarch64',
+     'arm',
+     'e2k',
+-- 
+2.12.0
+