* 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
esp_err_t provided by esp_err.h and thus is required and not optional.
While the python script adds the header, it wraps it with an __has_include
directive that is not supported on all compilers (notably GCC 4.8).
Closes https://github.com/espressif/esp-idf/pull/3424