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/dlfcn.cpp

@@ -0,0 +1,25 @@
+#include <assert.h>
+#include <dlfcn.h>
+
+extern "C" {
+
+int dlclose(void*)
+{
+    ASSERT_NOT_REACHED();
+}
+
+char* dlerror()
+{
+    ASSERT_NOT_REACHED();
+}
+
+void* dlopen(const char*, int)
+{
+    ASSERT_NOT_REACHED();
+}
+
+void* dlsym(void*, const char*)
+{
+    ASSERT_NOT_REACHED();
+}
+}