openbox: add missing propagated dependencies from pango

pango needs atomics support and C++ support, and those dependencies
where not propagated to the new openbox package.

Should fix:

  http://autobuild.buildroot.org/results/d3b/d3b17335f2e5720a69b4635602fef30a5ae34660/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/openbox/Config.in

@@ -4,6 +4,8 @@ config BR2_PACKAGE_OPENBOX
 	depends on BR2_TOOLCHAIN_HAS_THREADS # glib2
 	depends on BR2_USE_MMU # glib2
 	depends on BR2_USE_WCHAR # glib2
+	depends on BR2_ARCH_HAS_ATOMICS # pango -> cairo
+	depends on BR2_INSTALL_LIBSTDCPP # pango -> freetype
 	select BR2_PACKAGE_LIBGLIB2
 	select BR2_PACKAGE_LIBXML2
 	select BR2_PACKAGE_PANGO
@@ -17,7 +19,9 @@ config BR2_PACKAGE_OPENBOX
 
 	  http://openbox.org
 
-comment "openbox needs a toolchain w/ threads, wchar"
+comment "openbox needs a toolchain w/ C++, threads, wchar"
 	depends on BR2_USE_MMU
-	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR
+	depends on BR2_ARCH_HAS_ATOMICS
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR || \
+		!BR2_INSTALL_LIBSTDCPP
 	depends on BR2_PACKAGE_XORG7