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-oe/recipes-extended/byacc/byacc_20180510.bb b/meta-openembedded/meta-oe/recipes-extended/byacc/byacc_20180510.bb
new file mode 100644
index 0000000..f30c426
--- /dev/null
+++ b/meta-openembedded/meta-oe/recipes-extended/byacc/byacc_20180510.bb
@@ -0,0 +1,12 @@
+# Sigh. This is one of those places where everyone licenses it differently. Someone
+# even apply UCB to it (Free/Net/OpenBSD). The maintainer states that:
+# "I've found no reliable source which states that byacc must bear a UCB copyright."
+# Setting to PD as this is what the upstream has it as.
+
+LICENSE = "PD"
+LIC_FILES_CHKSUM = "file://package/debian/copyright;md5=8b2933503c0443e041d3168dc0c65640"
+require byacc.inc
+
+SRC_URI[md5sum] = "97fdc0745e0ff0cef5c09d57d0c6752d"
+SRC_URI[sha256sum] = "d0940dbffbc7e9c9dd4985c25349c390beede84ae1d9fe86b71c0aa659a6d693"
+