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/sys/select.cpp

@@ -0,0 +1,14 @@
+#include <Kernel/Syscall.h>
+#include <errno.h>
+#include <stdio.h>
+#include <sys/select.h>
+
+extern "C" {
+
+int select(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, struct timeval* timeout)
+{
+    Syscall::SC_select_params params { nfds, readfds, writefds, exceptfds, timeout };
+    int rc = syscall(SC_select, &params);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+}