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

libc/runtime/ftraceinit.greg.c

@@ -35,7 +35,7 @@
 textstartup int ftrace_init(void) {
   if (__intercept_flag(&__argc, __argv, "--ftrace")) {
     ftrace_install();
-    ++g_ftrace;
+    ++__ftrace;
   }
   return __argc;
 }