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/linux/CMakeLists.txt

@@ -14,3 +14,12 @@ endif()
 idf_component_register(INCLUDE_DIRS ${includes}
                        REQUIRED_IDF_TARGETS linux
                        SRCS ${srcs})
+
+if(${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()