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-multimedia/alsa/alsa-tools/musl.patch b/poky/meta/recipes-multimedia/alsa/alsa-tools/musl.patch
new file mode 100644
index 0000000..9eb129c
--- /dev/null
+++ b/poky/meta/recipes-multimedia/alsa/alsa-tools/musl.patch
@@ -0,0 +1,47 @@
+Upstream-Status: Backport
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+From 235d9c5e8381518b0a8661786e7e0cbdd1bbcd01 Mon Sep 17 00:00:00 2001
+From: Ross Burton <ross.burton@intel.com>
+Date: Tue, 12 Jun 2018 13:24:34 +0100
+Subject: [PATCH] ld10k1: define _GNU_SOURCE and use sighandler_t
+
+__sighandler_t is a glibc internal type which doesn't exist in musl.  By using
+AC_USE_SYSTEM_EXTENSIONS to get _GNU_SOURCE defined, both glibc and musl
+then expose sighandler_t.
+
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+Signed-off-by: Takashi Iwai <tiwai@suse.de>
+---
+ ld10k1/configure.ac      | 1 +
+ ld10k1/src/ld10k1_fnc1.c | 2 +-
+ 2 files changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/ld10k1/configure.ac b/ld10k1/configure.ac
+index 276b24e..f48ca31 100644
+--- a/ld10k1/configure.ac
++++ b/ld10k1/configure.ac
+@@ -4,6 +4,7 @@ AC_CONFIG_MACRO_DIR([m4])
+ AM_MAINTAINER_MODE([enable])
+ 
+ AC_CONFIG_HEADERS(config.h)
++AC_USE_SYSTEM_EXTENSIONS
+ AC_PROG_CC
+ AC_PROG_LD
+ AC_PROG_INSTALL
+diff --git a/ld10k1/src/ld10k1_fnc1.c b/ld10k1/src/ld10k1_fnc1.c
+index 343584c..ddc43c6 100644
+--- a/ld10k1/src/ld10k1_fnc1.c
++++ b/ld10k1/src/ld10k1_fnc1.c
+@@ -179,7 +179,7 @@ int main_loop(comm_param *param, int audigy, const char *card_id, int tram_size,
+ {
+ 	fd_set active_fd_set/*, read_fd_set*/;
+ 	int i, j, res = 0;
+-	__sighandler_t old_sig_pipe;
++	sighandler_t old_sig_pipe;
+ 
+ 	int main_sock = 0;
+ 	int data_sock = 0;
+-- 
+2.11.0
+