[zep fromlist] library: tls13: add guard for ssl_tls13_client_hello_has_exts()#86

valeriosetti wants to merge 1 commit intozephyrproject-rtos:zephyr_mbedtls_v4.1.0zephyrproject-rtos/mbedtls:zephyr_mbedtls_v4.1.0from

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