bdwgc: upgrade 7.6.0 -> 7.6.8

Highlights of this upgrade:
* Fix numerous bugs (concurrency, overflow, CVE-2016-9427, etc.)
* Fix various typos in comments and documentation
* AddressSanitizer and MemorySanitizer support
* RISC-V support

See the following for detailed changes:
* https://github.com/ivmai/bdwgc/releases/tag/v7.6.2
* https://github.com/ivmai/bdwgc/releases/tag/v7.6.4
* https://github.com/ivmai/bdwgc/releases/tag/v7.6.6
* https://github.com/ivmai/bdwgc/releases/tag/v7.6.8

Signed-off-by: Ivan Maidanski <ivmai@mail.ru>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/bdwgc/bdwgc/0001-configure.ac-add-check-for-NO_GETCONTEXT-definition.patch

@@ -1,29 +0,0 @@
-configure.ac: add check for NO_GETCONTEXT definition
-
-Signed-off-by: Samuel Martin <s.martin49@gmail.com>
-[yann.morin.1998@free.fr: add a comment, change variable name, use
- AS_IF, remove debug traces, use AC_CHECK_FUNCS (as suggested by
- Thomas)]
-Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
-Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
-
----
-Upstream-Status: Pending
- configure.ac | 6 ++++++
- 1 file changed, 6 insertions(+)
-
---- bdwgc-7.2f.orig/configure.ac	2014-06-01 19:00:47.000000000 +0200
-+++ bdwgc-7.2f/configure.ac	2014-12-23 14:13:11.585716713 +0100
-@@ -365,6 +365,12 @@
-   AC_MSG_RESULT($ac_cv_fno_strict_aliasing)
- fi
- 
-+# Check for getcontext (uClibc can be configured without it, for example)
-+AC_CHECK_FUNCS([getcontext])
-+AS_IF([test "$ac_cv_func_getcontext" = "no"],
-+  [CFLAGS="$CFLAGS -DNO_GETCONTEXT"
-+   CPPFLAGS="$CPPFLAGS -DNO_GETCONTEXT"])
-+
- case "$host" in
- # While IRIX 6 has libdl for the O32 and N32 ABIs, it's missing for N64
- # and unnecessary everywhere.

meta-oe/recipes-support/bdwgc/bdwgc/musl_header_fix.patch

@@ -1,27 +0,0 @@
-Add missing header to avoid:
-
-| 1472659610.016355: ../git/pthread_stop_world.c: In function 'GC_brief_async_signal_safe_sleep':
-| 1472659610.0540252: ../git/pthread_stop_world.c:397:22: error: storage size of 'tv' isn't known
-| 1472659610.0540252:        struct timeval tv;
-| 1472659610.0540252:                       ^~
-| 1472659610.054099: ../git/pthread_stop_world.c:397:22: warning: unused variable 'tv' [-Wunused-variable]
-| 1472659610.054099:        struct timeval tv;
-| 1472659610.054099:                       ^~
-| 1472659610.054099: Makefile:1530: recipe for target 'pthread_stop_world.lo' failed
-
-in musl builds.
-
-Upstream-Status: Pending
-
-Index: git/pthread_stop_world.c
-===================================================================
---- git.orig/pthread_stop_world.c
-+++ git/pthread_stop_world.c
-@@ -45,6 +45,7 @@
- #include <semaphore.h>
- #include <errno.h>
- #include <unistd.h>
-+#include <sys/time.h>
- #include "atomic_ops.h"
- 
- /* It's safe to call original pthread_sigmask() here.   */

meta-oe/recipes-support/bdwgc/bdwgc_7.6.8.bb

@@ -19,12 +19,10 @@ DESCRIPTION = "The Boehm-Demers-Weiser conservative garbage collector can be\
 HOMEPAGE = "http://www.hboehm.info/gc/"
 SECTION = "devel"
 LICENSE = "MIT"
-LIC_FILES_CHKSUM = "file://README.QUICK;md5=4f81f24ec69726c312487c2ac740e9e3"
+LIC_FILES_CHKSUM = "file://README.QUICK;md5=728501f233050290314d33fb07d883eb"
 
-SRCREV = "8ac1d84a40eb7a431fec1b8097e3f24b48fb23fa"
-SRC_URI = "git://github.com/ivmai/bdwgc.git \
-           file://0001-configure.ac-add-check-for-NO_GETCONTEXT-definition.patch \
-           file://musl_header_fix.patch \
+SRCREV = "8b2a98209a59c92e1be318e4acda507d83175f4d"
+SRC_URI = "git://github.com/ivmai/bdwgc.git;branch=release-7_6 \
           "
 
 FILES_${PN}-doc = "${datadir}"