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/netinet/in.h

@@ -0,0 +1,92 @@
+#ifndef _NETINET_IN_H
+#define _NETINET_IN_H 1
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#include <inttypes.h>
+#include <sys/socket.h>
+
+#define IPPROTO_IP		1
+#define IPPROTO_IPV6	2
+#define IPPROTO_ICMP	3
+#define IPPROTO_RAW		4
+#define IPPROTO_TCP		5
+#define IPPROTO_UDP		6
+
+#define IPV6_JOIN_GROUP		1
+#define IPV6_LEAVE_GROUP	2
+#define IPV6_MULTICAST_HOPS	3
+#define IPV6_MULTICAST_IF	4
+#define IPV6_MULTICAST_LOOP	5
+#define IPV6_UNICAST_HOPS	6
+#define IPV6_V6ONLY			7
+
+#define INADDR_ANY			0
+#define INADDR_BROADCAST	UINT32_MAX
+
+#define INET_ADDRSTRLEN		16
+#define INET6_ADDRSTRLEN	46
+
+#define IN6ADDR_ANY_INIT		{ { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
+#define IN6ADDR_LOOPBACK_INIT	{ { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }
+
+#if 0
+#define IN6_IS_ADDR_UNSPECIFIED(addr)
+#define IN6_IS_ADDR_LOOPBACK(addr)
+#define IN6_IS_ADDR_MULTICAST(addr)
+#define IN6_IS_ADDR_LINKLOCAL(addr)
+#define IN6_IS_ADDR_SITELOCAL(addr)
+#define IN6_IS_ADDR_V4MAPPED(addr)
+#define IN6_IS_ADDR_V4COMPAT(addr)
+#define IN6_IS_ADDR_MC_NODELOCAL(addr)
+#define IN6_IS_ADDR_MC_LINKLOCAL(addr)
+#define IN6_IS_ADDR_MC_SITELOCAL(addr)
+#define IN6_IS_ADDR_MC_ORGLOCAL(addr)
+#define IN6_IS_ADDR_MC_GLOBAL(addr)
+#endif
+
+typedef uint16_t in_port_t;
+typedef uint32_t in_addr_t;
+
+struct in_addr
+{
+	in_addr_t s_addr;
+};
+
+struct sockaddr_in
+{
+	sa_family_t		sin_family;	/* AF_INET. */
+	in_port_t		sin_port;	/* Port number. */
+	struct in_addr	sin_addr;	/* IP address. */
+};
+
+struct in6_addr
+{
+	uint8_t s6_addr[16];
+};
+
+struct sockaddr_in6
+{
+	sa_family_t		sin6_family;	/* AF_INET6. */
+	in_port_t		sin6_port;		/* Port number. */
+	uint32_t		sin6_flowinfo;	/* IPv6 traffic class and flow information. */
+	struct in6_addr	sin6_addr;		/* IPv6 address. */
+	uint32_t		sin6_scope_id;	/* Set of interfaces for a scope. */
+};
+
+extern const struct in6_addr in6addr_any;
+extern const struct in6_addr in6addr_loopback;
+
+struct ipv6_mreq
+{
+	struct in6_addr	ipv6mr_multiaddr;	/* IPv6 multicast address. */
+	unsigned		ipv6mr_interface;	/* Interface index. */
+};
+
+__END_DECLS
+
+#endif

userspace/libraries/LibC/include/netinet/tcp.h

@@ -0,0 +1,14 @@
+#ifndef __NETINET_TCP_H
+#define __NETINET_TCP_H 1
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define TCP_NODELAY 1
+
+__END_DECLS
+
+#endif