Introduce ctl::set and ctl::map

We now have a C++ red-black tree implementation that implements standard
template library compatible APIs while compiling 10x faster than libcxx.
It's not as beautiful as the red-black tree implementation in Plinko but
this will get the job done and the test proves it upholds all invariants

This change also restores CheckForMemoryLeaks() support and fixes a real
actual bug I discovered with Doug Lea's dlmalloc_inspect_all() function.

examples/greenbean.c

@@ -23,6 +23,7 @@
 #include <sys/auxv.h>
 #include <sys/socket.h>
 #include <time.h>
+#include "libc/mem/leaks.h"
 
 /**
  * @fileoverview greenbean lightweight threaded web server
@@ -411,7 +412,5 @@ int main(int argc, char *argv[]) {
   unassert(!pthread_mutex_destroy(&statuslock));
 
   // quality assurance
-  if (IsModeDbg()) {
-    CheckForMemoryLeaks();
-  }
+  CheckForMemoryLeaks();
 }