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/fcntl.cpp

@@ -0,0 +1,17 @@
+#include <Kernel/Syscall.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+extern "C" {
+
+int fcntl(int fd, int cmd, ...)
+{
+    va_list ap;
+    va_start(ap, cmd);
+    u32 extra_arg = va_arg(ap, u32);
+    int rc = syscall(SC_fcntl, fd, cmd, extra_arg);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+}