qt5base: enable C++11 if toolchain supports

Signed-off-by: Fatih Aşıcı <fatih.asici@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qt5/qt5base/qt5base.mk

@@ -195,7 +195,6 @@ define QT5BASE_CONFIGURE_CMDS
 		-device-option BR_COMPILER_CFLAGS="$(TARGET_CFLAGS)" \
 		-device-option BR_COMPILER_CXXFLAGS="$(TARGET_CXXFLAGS)" \
 		-device-option EGLFS_PLATFORM_HOOKS_SOURCES="$(QT5BASE_EGLFS_PLATFORM_HOOKS_SOURCES)" \
-		-no-c++11 \
 		$(QT5BASE_CONFIGURE_OPTS) \
 	)
 endef