package/strongswan: add option to enable systime-fix

When building embedded systems, which buildroot targets, the system
often does not know the current time. However, when verifying X509
certificates this is often required.

The system-fix plugin is a handy tool to configure the behavior when
the current time is unknown.

Signed-off-by: Martin Elshuber <martin.elshuber@theobroma-systems.com>

package/strongswan/Config.in

@@ -73,6 +73,9 @@ config BR2_PACKAGE_STRONGSWAN_TNCCS_20
 config BR2_PACKAGE_STRONGSWAN_TNCCS_DYNAMIC
 	bool "Enable dynamic TNCCS protocol discovery module"
 
+config BR2_PACKAGE_STRONGSWAN_SYSTIME_FIX
+	bool "Enable systime-fix plugin"
+
 config BR2_PACKAGE_STRONGSWAN_EAP
 	bool "Enable EAP protocols"
 	select BR2_PACKAGE_GMP

package/strongswan/strongswan.mk

@@ -37,6 +37,7 @@ STRONGSWAN_CONF_OPTS += \
 	--enable-vici=$(if $(BR2_PACKAGE_STRONGSWAN_VICI),yes,no) \
 	--enable-swanctl=$(if $(BR2_PACKAGE_STRONGSWAN_VICI),yes,no) \
 	--enable-wolfssl=$(if $(BR2_PACKAGE_STRONGSWAN_WOLFSSL),yes,no) \
+	--enable-systime-fix=$(if $(BR2_PACKAGE_STRONGSWAN_SYSTIME_FIX),yes,no) \
 	--with-ipseclibdir=/usr/lib \
 	--with-plugindir=/usr/lib/ipsec/plugins \
 	--with-imcvdir=/usr/lib/ipsec/imcvs \