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/termios.cpp

@@ -0,0 +1,31 @@
+#include <sys/syscall.h>
+#include <termios.h>
+#include <unistd.h>
+
+speed_t cfgetispeed(const struct termios*);
+
+speed_t cfgetospeed(const struct termios*);
+
+int cfsetispeed(struct termios*, speed_t);
+
+int cfsetospeed(struct termios*, speed_t);
+
+int tcdrain(int);
+
+int tcflow(int, int);
+
+int tcflush(int, int);
+
+int tcgetattr(int, struct termios* termios)
+{
+	return syscall(SYS_GET_TERMIOS, termios);
+}
+
+pid_t tcgetsid(int);
+
+int tcsendbreak(int, int);
+
+int tcsetattr(int, int, const struct termios* termios)
+{
+	return syscall(SYS_SET_TERMIOS, termios);
+}