package/rsyslog: add imhttp support

imhttp support is available since version 8.2010.0 and only depends on
civetweb:
https://github.com/rsyslog/rsyslog/commit/6102f6083cfa73fe4a91e3d34c4d1dc924465278

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

package/rsyslog/rsyslog.mk

@@ -30,11 +30,17 @@ RSYSLOG_CONF_OPTS += --disable-elasticsearch \
 	--disable-omhttp \
 	--disable-fmhttp \
 	--disable-imdocker \
-	--disable-imhttp \
 	--disable-impcap \
 	--disable-omhttpfs \
 	--disable-mmkubernetes
 
+ifeq ($(BR2_PACKAGE_CIVETWEB_LIB),y)
+RSYSLOG_DEPENDENCIES += civetweb
+RSYSLOG_CONF_OPTS += --enable-imhttp
+else
+RSYSLOG_CONF_OPTS += --disable-imhttp
+endif
+
 ifeq ($(BR2_PACKAGE_GNUTLS),y)
 RSYSLOG_DEPENDENCIES += gnutls
 RSYSLOG_CONF_OPTS += --enable-gnutls