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/conf/distro/include/tcmode-default.inc b/poky/meta/conf/distro/include/tcmode-default.inc
index 00399ae..f8da651 100644
--- a/poky/meta/conf/distro/include/tcmode-default.inc
+++ b/poky/meta/conf/distro/include/tcmode-default.inc
@@ -22,13 +22,14 @@
 PREFERRED_PROVIDER_virtual/nativesdk-${SDK_PREFIX}libc-initial ?= "nativesdk-glibc-initial"
 PREFERRED_PROVIDER_virtual/gettext ??= "gettext"
 
-GCCVERSION ?= "7.%"
+GCCVERSION ?= "8.%"
 SDKGCCVERSION ?= "${GCCVERSION}"
-BINUVERSION ?= "2.30%"
-GDBVERSION ?= "8.0%"
-GLIBCVERSION ?= "2.27%"
-LINUXLIBCVERSION ?= "4.15%"
-QEMUVERSION ?= "2.11%"
+BINUVERSION ?= "2.31%"
+GDBVERSION ?= "8.2%"
+GLIBCVERSION ?= "2.28%"
+LINUXLIBCVERSION ?= "4.18%"
+QEMUVERSION ?= "3.0%"
+GOVERSION ?= "1.11%"
 
 PREFERRED_VERSION_gcc ?= "${GCCVERSION}"
 PREFERRED_VERSION_gcc-cross-${TARGET_ARCH} ?= "${GCCVERSION}"
@@ -65,14 +66,10 @@
 PREFERRED_VERSION_nativesdk-glibc-initial  ?= "${GLIBCVERSION}"
 PREFERRED_VERSION_cross-localedef-native   ?= "${GLIBCVERSION}"
 
-
 PREFERRED_VERSION_qemu ?= "${QEMUVERSION}"
 PREFERRED_VERSION_qemu-native ?= "${QEMUVERSION}"
 PREFERRED_VERSION_nativesdk-qemu ?= "${QEMUVERSION}"
-# Setup suitable toolchain flags
-require conf/distro/include/as-needed.inc
 
-GOVERSION ?= "1.9%"
 PREFERRED_VERSION_virtual/${TARGET_PREFIX}go ?= "${GOVERSION}"
 PREFERRED_VERSION_go-cross-${TARGET_ARCH} ?= "${GOVERSION}"
 PREFERRED_VERSION_go-crosssdk-${SDK_ARCH} ?= "${GOVERSION}"