BuildSystem: Move all userpace libraries under the userspace directory

As the number of libraries is increasing, root directory starts to
expand. This adds better organization for libraries

userspace/libraries/LibC/include/arpa/inet.h

@@ -0,0 +1,25 @@
+#ifndef _INET_H
+#define _INET_H 1
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/arpa_inet.h.html
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#include <netinet/in.h>
+#include <inttypes.h>
+
+uint32_t htonl(uint32_t);
+uint16_t htons(uint16_t);
+uint32_t ntohl(uint32_t);
+uint16_t ntohs(uint16_t);
+
+in_addr_t	inet_addr(const char* cp);
+char*		inet_ntoa(struct in_addr in);
+const char*	inet_ntop(int af, const void* __restrict src, char* __restrict dst, socklen_t size);
+int			inet_pton(int af, const char* __restrict src, void* __restrict dst);
+
+__END_DECLS
+
+#endif