package/qt5/qt5base: exclude OpenSSL functionality for Qt 5.6.x

No patch back-porting OpenSSL 1.1.x support to Qt 5.6.x is available.

https://development.qt-project.narkive.com/RW4wxYXY/openssl-1-1-x-support-on-qt-5-6-5-9

Signed-off-by: James Grant <james.grant@jci.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qt5/qt5base/qt5base.mk

@@ -188,8 +188,13 @@ else
 QT5BASE_CONFIGURE_OPTS += -no-eglfs
 endif
 
+ifeq ($(BR2_PACKAGE_QT5_VERSION_5_6),y)
+# No OpenSSL 1.1.x support in Qt 5.6.x
+QT5BASE_CONFIGURE_OPTS += -no-openssl
+else
 QT5BASE_CONFIGURE_OPTS += $(if $(BR2_PACKAGE_OPENSSL),-openssl,-no-openssl)
 QT5BASE_DEPENDENCIES   += $(if $(BR2_PACKAGE_OPENSSL),openssl)
+endif
 
 QT5BASE_CONFIGURE_OPTS += $(if $(BR2_PACKAGE_QT5BASE_FONTCONFIG),-fontconfig,-no-fontconfig)
 QT5BASE_DEPENDENCIES   += $(if $(BR2_PACKAGE_QT5BASE_FONTCONFIG),fontconfig)