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/meta-openembedded/meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc/0012-purgatory-string.c-avoid-inclusion-of-string.h.patch b/meta-openembedded/meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc/0012-purgatory-string.c-avoid-inclusion-of-string.h.patch
new file mode 100644
index 0000000..20934da
--- /dev/null
+++ b/meta-openembedded/meta-initramfs/recipes-kernel/kexec/kexec-tools-klibc/0012-purgatory-string.c-avoid-inclusion-of-string.h.patch
@@ -0,0 +1,31 @@
+From 2d2ad16f9328a7cbb3f5b8479ae93eb923a0727f Mon Sep 17 00:00:00 2001
+From: Andrea Adami <andrea.adami@gmail.com>
+Date: Thu, 19 Apr 2018 00:28:14 +0200
+Subject: [PATCH] purgatory/string.c: avoid inclusion of string.h
+
+Fix
+
+ purgatory/string.c:39:5: error: conflicting types for 'memcmp'
+
+Upstream-Status: Inappropriate [klibc specific]
+Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
+
+---
+ purgatory/string.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/purgatory/string.c b/purgatory/string.c
+index f06c460..c5e978a 100644
+--- a/purgatory/string.c
++++ b/purgatory/string.c
+@@ -1,5 +1,7 @@
+ #include <stddef.h>
++#ifndef __KLIBC__
+ #include <string.h>
++#endif
+ 
+ size_t strnlen(const char *s, size_t max)
+ {
+-- 
+2.7.4
+