Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibC/termios.cpp

@@ -0,0 +1,51 @@
+#include <Kernel/Syscall.h>
+#include <assert.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+#include <termios.h>
+
+extern "C" {
+
+int tcgetattr(int fd, struct termios* t)
+{
+    return ioctl(fd, TCGETS, t);
+}
+
+int tcsetattr(int fd, int optional_actions, const struct termios* t)
+{
+    switch (optional_actions) {
+    case TCSANOW:
+        return ioctl(fd, TCSETS, t);
+    case TCSADRAIN:
+        return ioctl(fd, TCSETSW, t);
+    case TCSAFLUSH:
+        return ioctl(fd, TCSETSF, t);
+    }
+    errno = EINVAL;
+    return -1;
+}
+
+int tcflow(int fd, int action)
+{
+    (void)fd;
+    (void)action;
+    ASSERT_NOT_REACHED();
+}
+
+int tcflush(int fd, int queue_selector)
+{
+    (void)fd;
+    (void)queue_selector;
+    ASSERT_NOT_REACHED();
+}
+
+speed_t cfgetispeed(const struct termios* tp)
+{
+    return tp->c_ispeed;
+}
+
+speed_t cfgetospeed(const struct termios* tp)
+{
+    return tp->c_ospeed;
+}
+}