package/wireshark: add libssh optional dependency

- Optional dependency to libssh has been added with version 2.2.1 and
  https://github.com/wireshark/wireshark/commit/d6da95231ee790fd884ca2a41fe59aa9b05ccde9
- Specify the path to found libssh as this is done for other options

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/wireshark/wireshark.mk

@@ -92,6 +92,13 @@ else
 WIRESHARK_CONF_OPTS += --without-libnl
 endif
 
+ifeq ($(BR2_PACKAGE_LIBSSH),y)
+WIRESHARK_CONF_OPTS += --with-libssh=$(STAGING_DIR)/usr
+WIRESHARK_DEPENDENCIES += libssh
+else
+WIRESHARK_CONF_OPTS += --without-libssh
+endif
+
 ifeq ($(BR2_PACKAGE_SBC),y)
 WIRESHARK_CONF_OPTS += --with-sbc=yes
 WIRESHARK_DEPENDENCIES += sbc