Update esp_http_client example to build for linux target

examples/protocols/linux_stubs/esp_stubs/include/esp_event.h

@@ -0,0 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include "esp_err.h"
+
+esp_err_t esp_event_loop_create_default(void);

examples/protocols/linux_stubs/esp_stubs/include/esp_netif.h

@@ -0,0 +1,11 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <ifaddrs.h>
+#include "esp_err.h"
+
+esp_err_t esp_netif_init(void);

examples/protocols/linux_stubs/esp_stubs/include/nvs_flash.h

@@ -0,0 +1,14 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include "esp_err.h"
+
+#define ESP_ERR_NVS_BASE                    0x1100                     /*!< Starting number of error codes */
+#define ESP_ERR_NVS_NO_FREE_PAGES           (ESP_ERR_NVS_BASE + 0x0d)  /*!< NVS partition doesn't contain any empty pages. This may happen if NVS partition was truncated. Erase the whole partition and call nvs_flash_init again. */
+#define ESP_ERR_NVS_NEW_VERSION_FOUND       (ESP_ERR_NVS_BASE + 0x10)  /*!< NVS partition contains data in new format and cannot be recognized by this version of code */
+
+esp_err_t nvs_flash_init(void);
+
+esp_err_t nvs_flash_erase(void);

examples/protocols/linux_stubs/esp_stubs/include/protocol_examples_common.h

@@ -0,0 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include "esp_err.h"
+
+esp_err_t example_connect(void);