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/sys/socket.cpp

@@ -0,0 +1,79 @@
+#include <sys/socket.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+int accept(int socket, struct sockaddr* __restrict address, socklen_t* __restrict address_len)
+{
+	return syscall(SYS_ACCEPT, socket, address, address_len);
+}
+
+int bind(int socket, const struct sockaddr* address, socklen_t address_len)
+{
+	return syscall(SYS_BIND, socket, address, address_len);
+}
+
+int connect(int socket, const struct sockaddr* address, socklen_t address_len)
+{
+	return syscall(SYS_CONNECT, socket, address, address_len);
+}
+
+int listen(int socket, int backlog)
+{
+	return syscall(SYS_LISTEN, socket, backlog);
+}
+
+ssize_t recv(int socket, void* __restrict buffer, size_t length, int flags)
+{
+	return recvfrom(socket, buffer, length, flags, nullptr, nullptr);
+}
+
+ssize_t recvfrom(int socket, void* __restrict buffer, size_t length, int flags, struct sockaddr* __restrict address, socklen_t* __restrict address_len)
+{
+	sys_recvfrom_t arguments {
+		.socket = socket,
+		.buffer = buffer,
+		.length = length,
+		.flags = flags,
+		.address = address,
+		.address_len = address_len
+	};
+	return syscall(SYS_RECVFROM, &arguments);
+}
+
+ssize_t send(int socket, const void* message, size_t length, int flags)
+{
+	return sendto(socket, message, length, flags, nullptr, 0);
+}
+
+ssize_t sendto(int socket, const void* message, size_t length, int flags, const struct sockaddr* dest_addr, socklen_t dest_len)
+{
+	sys_sendto_t arguments {
+		.socket = socket,
+		.message = message,
+		.length = length,
+		.flags = flags,
+		.dest_addr = dest_addr,
+		.dest_len = dest_len
+	};
+	return syscall(SYS_SENDTO, &arguments);
+}
+
+int socket(int domain, int type, int protocol)
+{
+	return syscall(SYS_SOCKET, domain, type, protocol);
+}
+
+int getsockname(int socket, struct sockaddr* __restrict address, socklen_t* __restrict address_len)
+{
+	return syscall(SYS_GETSOCKNAME, socket, address, address_len);
+}
+
+int getsockopt(int socket, int level, int option_name, void* __restrict option_value, socklen_t* __restrict option_len)
+{
+	return syscall(SYS_GETSOCKOPT, socket, level, option_name, option_value, option_len);
+}
+
+int setsockopt(int socket, int level, int option_name, const void* option_value, socklen_t option_len)
+{
+	return syscall(SYS_SETSOCKOPT, socket, level, option_name, option_value, option_len);
+}