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/meson/meson/gtkdoc-flags.patch b/poky/meta/recipes-devtools/meson/meson/gtkdoc-flags.patch
new file mode 100644
index 0000000..ecf3489
--- /dev/null
+++ b/poky/meta/recipes-devtools/meson/meson/gtkdoc-flags.patch
@@ -0,0 +1,44 @@
+Ensure that in a cross compile only the target flags are passed to gtk-doc, and
+not the native flags.
+
+Upstream-Status: Submitted [https://github.com/mesonbuild/meson/pull/4261]
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+diff --git a/mesonbuild/modules/gnome.py b/mesonbuild/modules/gnome.py
+index 4af33304..8751f53c 100644
+--- a/mesonbuild/modules/gnome.py
++++ b/mesonbuild/modules/gnome.py
+@@ -851,17 +851,30 @@ This will become a hard error in the future.''')
+             if not isinstance(incd.held_object, (str, build.IncludeDirs)):
+                 raise MesonException(
+                     'Gir include dirs should be include_directories().')
++
+         cflags.update(get_include_args(inc_dirs))
+-        cflags.update(state.environment.coredata.get_external_args('c'))
++        if state.environment.is_cross_build():
++            cflags.update(state.environment.cross_info.config["properties"].get('c_args', ""))
++        else:
++            cflags.update(state.environment.coredata.get_external_args('c'))
++
+         ldflags = OrderedSet()
+         ldflags.update(internal_ldflags)
+-        ldflags.update(state.environment.coredata.get_external_link_args('c'))
++        if state.environment.is_cross_build():
++            ldflags.update(state.environment.cross_info.config["properties"].get('c_link_args', ""))
++        else:
++            ldflags.update(state.environment.coredata.get_external_link_args('c'))
+         ldflags.update(external_ldflags)
++
+         if cflags:
+             args += ['--cflags=%s' % ' '.join(cflags)]
+         if ldflags:
+             args += ['--ldflags=%s' % ' '.join(ldflags)]
+-        compiler = state.environment.coredata.compilers.get('c')
++
++        if state.environment.is_cross_build():
++            compiler = state.environment.coredata.cross_compilers.get('c')
++        else:
++            compiler = state.environment.coredata.compilers.get('c')
+         if compiler:
+             args += ['--cc=%s' % ' '.join(compiler.get_exelist())]
+             args += ['--ld=%s' % ' '.join(compiler.get_linker_exelist())]