Make some systemic improvements

- add vdso dump utility
- tests now log stack usage
- rename g_ftrace to __ftrace
- make internal spinlocks go faster
- add conformant c11 atomics library
- function tracing now logs stack usage
- make function call tracing thread safe
- add -X unsecure (no ssl) mode to redbean
- munmap() has more consistent behavior now
- pacify fsync() calls on python unit tests
- make --strace flag work better in redbean
- start minimizing and documenting compiler flags

third_party/python/Include/ceval.h

@@ -119,7 +119,7 @@ int _Py_CheckRecursiveCall(const char *);
         rc = _Py_CheckRecursiveCall(where);                             \
       } else {                                                          \
         rsp = (intptr_t)__builtin_frame_address(0);                     \
-        bot = GetStackAddr(32768);                                      \
+        bot = (intptr_t)GetStackAddr(32768);                            \
         if (UNLIKELY(rsp < bot)) {                                      \
           PyErr_Format(PyExc_MemoryError, "Stack overflow%s", where);   \
           rc = -1;                                                      \