refactor(linux): Unified libbsd handling

* 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

components/esp_http_server/src/httpd_parse.c

@@ -7,10 +7,6 @@
 
 #include <stdlib.h>
 #include <string.h>
-#if __has_include(<bsd/string.h>)
-// for strlcpy
-#include <bsd/string.h>
-#endif
 #include <sys/param.h>
 #include <esp_log.h>
 #include <esp_err.h>