lkl tools: fix inet_pton declaration

gcc reports an implicit declaration warning about inet_pton function.
This commit fixes the issue by including or defining it.

Signed-off-by: Akira Moroo <retrage01@gmail.com>

Author: retrage

tools/lkl/lib/config.c

@@ -1,6 +1,11 @@
 #include <stdlib.h>
 #define _HAVE_STRING_ARCH_strtok_r
 #include <string.h>
+#ifndef __MINGW32__
+#include <arpa/inet.h>
+#else
+#define inet_pton lkl_inet_pton
+#endif
 #include <lkl_host.h>
 #include <lkl_config.h>