esp_http_client: remove dependency of esp_stubs from esp_http_client. Add esp_event stubs in linux component

components/linux/CMakeLists.txt

@@ -3,5 +3,6 @@ if(NOT "${target}" STREQUAL "linux")
     return()
 endif()
 
-idf_component_register(INCLUDE_DIRS include
+idf_component_register(SRCS esp_event_stubs.c
+                       INCLUDE_DIRS include ${IDF_PATH}/components/esp_event/include
                        REQUIRED_IDF_TARGETS linux)

components/linux/esp_event_stubs.c

@@ -0,0 +1,18 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "esp_err.h"
+#include "esp_event.h"
+
+esp_err_t esp_event_loop_create_default(void)
+{
+    return ESP_OK;
+}
+
+esp_err_t esp_event_post(esp_event_base_t event_base, int32_t event_id,
+        const void* event_data, size_t event_data_size, TickType_t ticks_to_wait)
+{
+    return ESP_OK;
+}