rtmp-services: Add rtmp URL lookup config file

This URL is set via cmake instead of being baked in to the actual source
code.

plugins/rtmp-services/CMakeLists.txt

@@ -7,10 +7,26 @@ set(rtmp-services_SOURCES
 	rtmp-custom.c
 	rtmp-services-main.c)
 
+set(RTMP_SERVICES_URL
+	"https://obsproject.com/obs2_update/rtmp-services"
+	CACHE STRING "Default services package URL")
+
+configure_file(
+	"${CMAKE_CURRENT_SOURCE_DIR}/lookup-config.h.in"
+	"${CMAKE_BINARY_DIR}/plugins/rtmp-services/lookup-config.h")
+
+set(rtmp-services_config_HEADERS
+	"${CMAKE_BINARY_DIR}/plugins/rtmp-services/lookup-config.h")
+
 add_library(rtmp-services MODULE
-	${rtmp-services_SOURCES})
+	${rtmp-services_SOURCES}
+	${rtmp-services_config_HEADERS})
 target_link_libraries(rtmp-services
 	libobs
 	${OBS_JANSSON_IMPORT})
 
+target_include_directories(rtmp-services
+	PUBLIC
+		"$<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/plugins/rtmp-services>")
+
 install_obs_plugin_with_data(rtmp-services data)

plugins/rtmp-services/lookup-config.h.in

@@ -0,0 +1,3 @@
+#pragma once
+
+#define RTMP_SERVICES_URL "@RTMP_SERVICES_URL@"