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/log/checkfail.c

@@ -45,8 +45,8 @@ relegated void __check_fail(const char *suffix, const char *opstr,
   size_t i;
   va_list va;
   char hostname[32];
-  __strace = 0;
-  g_ftrace = 0;
+  --__strace;
+  --__ftrace;
   e = errno;
   __start_fatal(file, line);
   __stpcpy(hostname, "unknown");