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-devtools/gcc/gcc-7.3.inc b/poky/meta/recipes-devtools/gcc/gcc-7.3.inc
index d4aaca4..c7c88f1 100644
--- a/poky/meta/recipes-devtools/gcc/gcc-7.3.inc
+++ b/poky/meta/recipes-devtools/gcc/gcc-7.3.inc
@@ -32,7 +32,6 @@
 SRC_URI = "\
            ${BASEURI} \
            file://0001-gcc-4.3.1-ARCH_FLAGS_FOR_TARGET.patch \
-           file://0008-c99-snprintf.patch \
            file://0009-gcc-poison-system-directories.patch \
            file://0010-gcc-poison-dir-extend.patch \
            file://0011-gcc-4.3.3-SYSROOT_CFLAGS_FOR_TARGET.patch \
@@ -72,6 +71,7 @@
            file://0045-Link-libgcc-using-LDFLAGS-not-just-SHLIB_LDFLAGS.patch \
            file://0047-sync-gcc-stddef.h-with-musl.patch \
            file://0048-gcc-Enable-static-PIE.patch \
+           file://0049-gcc-override-TARGET_LIBC_PROVIDES_SSP.patch \
            file://fix-segmentation-fault-precompiled-hdr.patch \
            file://no-sse-fix-test-case-failures.patch \
            ${BACKPORTS} \
@@ -95,10 +95,12 @@
 JAVA = ""
 
 LTO = "--enable-lto"
+SSP ?= "--disable-libssp"
+SSP_mingw32 = "--enable-libssp"
 
 EXTRA_OECONF_BASE = "\
     ${LTO} \
-    --enable-libssp \
+    ${SSP} \
     --enable-libitm \
     --disable-bootstrap \
     --disable-libmudflap \
@@ -120,9 +122,10 @@
     --with-system-zlib \
     --disable-lto \
     --disable-plugin \
+    --enable-linker-build-id \
     --enable-decimal-float=no \
     --without-isl \
-    gcc_cv_libc_provides_ssp=yes \
+    --disable-libssp \
 "
 
 EXTRA_OECONF_PATHS = "\