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/CMakeLists.txt

@@ -20,12 +20,3 @@ idf_component_register(SRCS "src/httpd_main.c"
                     PRIV_INCLUDE_DIRS ${priv_inc_dir}
                     REQUIRES ${requires}
                     PRIV_REQUIRES ${priv_req})
-
-if(${IDF_TARGET} STREQUAL "linux")
-    find_library(LIB_BSD bsd)
-    if(LIB_BSD)
-        target_link_libraries(${COMPONENT_LIB} PRIVATE ${LIB_BSD})
-    elseif(NOT CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
-        message(WARNING "Missing LIBBSD library. Install libbsd-dev package and/or check linker directories.")
-    endif()
-endif()

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>