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

tool/net/help.txt

@@ -54,6 +54,7 @@ FLAGS
   -Z        log worker system calls
   -f        log worker function calls
   -B        only use stronger cryptography
+  -X        disable ssl server and client support
   -s        increase silence                  [repeatable]
   -v        increase verbosity                [repeatable]
   -V        increase ssl verbosity            [repeatable]
@@ -1980,13 +1981,15 @@ UNIX MODULE
 
     Makes directories.
 
+    Unlike mkdir() this convenience wrapper will automatically create
+    parent parent directories as needed. If the directory already exists
+    then, unlike mkdir() which returns EEXIST, the makedirs() function
+    will return success.
+
     `path` is the path of the directory you wish to create.
 
     `mode` is octal permission bits, e.g. `0755`.
 
-    Unlike mkdir() this convenience wrapper will automatically create
-    parent parent directories as needed.
-
   unix.chdir(path:str)
       ├─→ true
       └─→ nil, unix.Errno