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-support/libgpg-error/libgpg-error/0002-syscfg-Add-support-for-arc-unknown-linux-gnu.patch b/poky/meta/recipes-support/libgpg-error/libgpg-error/0002-syscfg-Add-support-for-arc-unknown-linux-gnu.patch
new file mode 100644
index 0000000..197652f
--- /dev/null
+++ b/poky/meta/recipes-support/libgpg-error/libgpg-error/0002-syscfg-Add-support-for-arc-unknown-linux-gnu.patch
@@ -0,0 +1,35 @@
+From ae6a3f20345dac4b9daab8c39ac2d3fb3f2c21e3 Mon Sep 17 00:00:00 2001
+From: Werner Koch <wk@gnupg.org>
+Date: Fri, 21 Sep 2018 14:37:21 +0200
+Subject: [PATCH Libgpg-error] syscfg: Add support for arc-unknown-linux-gnu
+
+* src/mkheader.c (canon_host_triplet): Add to table.
+--
+
+Note that unknown in the above triplet is actually a wildcard for 4
+part triplets.
+
+Signed-off-by: Werner Koch <wk@gnupg.org>
+
+Upstream-Status: Backport [http://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgpg-error.git;a=commit;h=f4f0da74f526d7e35cedbc2e93454df6440dbfa5]
+---
+ src/mkheader.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/mkheader.c b/src/mkheader.c
+index 7a38a1bec1a4..a4866e96ef43 100644
+--- a/src/mkheader.c
++++ b/src/mkheader.c
+@@ -92,7 +92,8 @@ canon_host_triplet (const char *triplet, int no_vendor_hack)
+     {"i486-pc-linux-gnu", "i686-unknown-linux-gnu" },
+     {"i586-pc-linux-gnu" },
+     {"i686-pc-linux-gnu" },
+-    {"arc-oe-linux-uclibc" }, /* Other CPU but same struct.  */
++    {"arc-oe-linux-gnu"    }, /* Other CPU but same struct.  */
++    {"arc-oe-linux-uclibc" }, /* and uclibc is also the same.  */
+ 
+     {"i486-pc-gnu", "i686-unknown-gnu"},
+     {"i586-pc-gnu"},
+-- 
+2.17.1
+