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/testlib/testmain.c

@@ -67,6 +67,7 @@ Flags:\n\
 STATIC_YOINK("__die");
 STATIC_YOINK("__get_symbol_by_addr");
 STATIC_YOINK("testlib_quota_handlers");
+STATIC_YOINK("stack_usage_logging");
 
 static bool runbenchmarks_;