boost: build context and coroutine for arm

When cross-compiling for arm architecture, bjam fails to properly
detect the abi, which causes a failed conditional to omit the
assembly code that supports the platform.

(From OE-Core rev: 920f2c479c3cf30d92f79dc9098e5915c05cc5e1)

(From poky rev: 22cbd08cb1b8fd61d296d1c136e433d26d73dfd5)

Change-Id: Icd329c5cec2fe5597c61d4e4d4d6820d5abc7d79
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/poky/meta/recipes-support/boost/boost.inc b/poky/meta/recipes-support/boost/boost.inc
index 0461ec6..0ff5b7a 100644
--- a/poky/meta/recipes-support/boost/boost.inc
+++ b/poky/meta/recipes-support/boost/boost.inc
@@ -32,6 +32,7 @@
 BOOST_LIBS_append_x86 = " context coroutine"
 BOOST_LIBS_append_x86-64 = " context coroutine"
 BOOST_LIBS_append_powerpc = " context coroutine"
+BOOST_LIBS_append_arm = " context coroutine"
 # need consistent settings for native builds (x86 override not applied for native)
 BOOST_LIBS_remove_class-native = " context coroutine"
 # does not compile
@@ -149,6 +150,9 @@
 # Adjust the build for x32
 BJAM_OPTS_append_x86-x32 = " abi=x32 address-model=64"
 
+# cross compiling for arm fails to detect abi, so provide some help
+BJAM_OPTS_append_arm = " abi=aapcs architecture=arm"
+
 do_configure() {
 	cp -f ${S}/boost/config/platform/linux.hpp ${S}/boost/config/platform/linux-gnueabi.hpp