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-kernel/linux-libc-headers/linux-libc-headers_4.18.bb b/poky/meta/recipes-kernel/linux-libc-headers/linux-libc-headers_4.18.bb
new file mode 100644
index 0000000..eb7bee7
--- /dev/null
+++ b/poky/meta/recipes-kernel/linux-libc-headers/linux-libc-headers_4.18.bb
@@ -0,0 +1,13 @@
+require linux-libc-headers.inc
+
+SRC_URI_append_libc-musl = "\
+    file://0001-libc-compat.h-fix-some-issues-arising-from-in6.h.patch \
+    file://0002-libc-compat.h-prevent-redefinition-of-struct-ethhdr.patch \
+    file://0003-remove-inclusion-of-sysinfo.h-in-kernel.h.patch \
+    file://0001-libc-compat.h-musl-_does_-define-IFF_LOWER_UP-DORMAN.patch \
+    file://0001-if_ether-move-muslc-ethhdr-protection-to-uapi-file.patch \
+    file://0001-include-linux-stddef.h-in-swab.h-uapi-header.patch \
+   "
+
+SRC_URI[md5sum] = "bee5fe53ee1c3142b8f0c12c0d3348f9"
+SRC_URI[sha256sum] = "19d8bcf49ef530cd4e364a45b4a22fa70714b70349c8100e7308488e26f1eaf1"