package/glmark2: needs gcc >= 4.9 for C++14

Fixes:
    http://autobuild.buildroot.org/results/511/51162285d197deabb63727c19cdf5512b0e68f29/

[Peter: also add libstdcpp dependency]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Bernd Kuhls <bernd.kuhls@t-online.de>
Cc: Spenser Gilliland <spenser@gillilanding.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/glmark2/Config.in

@@ -10,11 +10,17 @@ config BR2_PACKAGE_GLMARK2_GL
 	depends on BR2_PACKAGE_HAS_LIBGL
 	depends on BR2_PACKAGE_MESA3D_DRI_DRIVER
 
+comment "glmark2 needs a toolchain w/ C++, gcc >= 4.9"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
+
 comment "glmark2 needs an OpenGL or an openGL ES and EGL backend provided by mesa3d"
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 && BR2_INSTALL_LIBSTDCPP
 	depends on !BR2_PACKAGE_GLMARK2_GL && !BR2_PACKAGE_GLMARK2_EGL_GLES
 
 config BR2_PACKAGE_GLMARK2
 	bool "glmark2"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # C++14
 	depends on BR2_PACKAGE_GLMARK2_GL || BR2_PACKAGE_GLMARK2_EGL_GLES
 	select BR2_PACKAGE_JPEG
 	select BR2_PACKAGE_LIBPNG