When the REPL input backend is unavailable, linenoise() may return NULL
immediately. esp_console_repl_task() currently retries without yielding,
which can make the console_repl task spin continuously.
For USB Serial/JTAG console this can happen when the REPL is started
without an attached USB host. Since the REPL task has priority 2, this
can starve lower-priority tasks, prevent app_main from continuing after
esp_console_start_repl(), and trigger the task watchdog due to IDLE not
running.
Add a small delay before retrying when linenoise() returns NULL.
Closes https://github.com/espressif/esp-idf/issues/18485
* Users can now use libbsd string.h and sys/cdefs.h functionality
(e.g., strlcpy, containerof) on Linux by just including
string.h or sys/cdefs.h. In other words, the includes are the same
on the Linux target as well as on chips targets (ESP32, etc.).
* libbsd linking is done by the linux component (belongs to common
components) now instead of handling it separately in each component
