package/janus-gateway: add libcurl optional dependency

libcurl is an optional dependency which is enabled by default since at
least version 0.0.9 and
https://github.com/meetecho/janus-gateway/commit/ca9c0a86f975f88fbdd791af3cb4f8986883c1c2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 60cf07079b78d4c4bb495fd18cb2a145a4cb3635)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/janus-gateway/janus-gateway.mk

@@ -124,6 +124,13 @@ else
 JANUS_GATEWAY_CONF_OPTS += --disable-websockets
 endif
 
+ifeq ($(BR2_PACKAGE_LIBCURL),y)
+JANUS_GATEWAY_DEPENDENCIES += libcurl
+JANUS_GATEWAY_CONF_OPTS += --enable-turn-rest-api
+else
+JANUS_GATEWAY_CONF_OPTS += --disable-turn-rest-api
+endif
+
 ifeq ($(BR2_PACKAGE_SYSTEMD),y)
 JANUS_GATEWAY_DEPENDENCIES += systemd
 JANUS_GATEWAY_CONF_OPTS += --enable-systemd-sockets