msgpack: add dependency on atomic operations

This fixes:
http://autobuild.buildroot.net/results/44849a386cefb8899f4560296bfbbd8ea19ee910/

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
[yann.morin.1998@free.fr: use the new symbol; remove comment strings]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/msgpack/Config.in

@@ -1,7 +1,7 @@
 config BR2_PACKAGE_MSGPACK
 	bool "msgpack"
 	depends on BR2_INSTALL_LIBSTDCPP
-	depends on !BR2_arc # atomic builtins
+	depends on BR2_ARCH_HAS_ATOMICS
 	help
 	  MessagePack is an efficient binary serialization format.
 
@@ -11,5 +11,5 @@ config BR2_PACKAGE_MSGPACK
 	  http://msgpack.org/
 
 comment "msgpack needs a toolchain w/ C++"
+	depends on BR2_ARCH_HAS_ATOMICS
 	depends on !BR2_INSTALL_LIBSTDCPP
-	depends on !BR2_arc

package/python-msgpack/Config.in

@@ -3,7 +3,7 @@ config BR2_PACKAGE_PYTHON_MSGPACK
 	depends on BR2_PACKAGE_PYTHON
 	select BR2_PACKAGE_MSGPACK
 	depends on BR2_INSTALL_LIBSTDCPP # msgpack
-	depends on !BR2_arc # msgpack - atomic builtins
+	depends on BR2_ARCH_HAS_ATOMICS # msgpack
 	help
 	  MessagePack (http://msgpack.org/) is a fast, compact binary
 	  serialization format, suitable for similar data to JSON.
@@ -13,6 +13,6 @@ config BR2_PACKAGE_PYTHON_MSGPACK
 	  https://pypi.python.org/pypi/msgpack-python/
 
 comment "python-msgpack needs a toolchain w/ C++"
+	depends on BR2_ARCH_HAS_ATOMICS
 	depends on BR2_PACKAGE_PYTHON
 	depends on !BR2_INSTALL_LIBSTDCPP
-	depends on !BR2_arc