revert libpurple tests

Author: vitalyster

tests/CMakeLists.txt

@@ -10,14 +10,3 @@ add_custom_target(extended_test
   COMMAND python ${CMAKE_CURRENT_SOURCE_DIR}/start.py
   WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/tests_output
 )
-
-if(PROTOBUF_FOUND)
-	if(PURPLE_FOUND)
-		add_subdirectory(libpurple)
-		add_custom_target(test_backend_libpurple
-			COMMAND ${CMAKE_CURRENT_BINARY_DIR}/libpurple/backend_libpurple_test
-		)
-		add_dependencies(test test_backend_libpurple)
-		add_dependencies(extended_test test_backend_libpurple)
-	endif()
-endif()