cmake: make main a component again

examples/protocols/http_server/advanced_tests/CMakeLists.txt

@@ -1,9 +1,7 @@
-# The following four lines of boilerplate have to be in your project's CMakeLists
+# The following lines of boilerplate have to be in your project's CMakeLists
 # in this exact order for cmake to work correctly
 cmake_minimum_required(VERSION 3.5)
 
-set(MAIN_SRCS main/tests.c main/main.c)
-
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(tests)
 

examples/protocols/http_server/advanced_tests/main/CMakeLists.txt

@@ -0,0 +1,5 @@
+set(COMPONENT_SRCS "main.c"
+                   "tests.c")
+set(COMPONENT_ADD_INCLUDEDIRS ". include")
+
+register_component()