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/counters.inc

@@ -1,4 +1,5 @@
 C(accepterrors)
+C(acceptflakes)
 C(acceptinterrupts)
 C(acceptresets)
 C(badlengths)
@@ -74,6 +75,7 @@ C(sslunknownca)
 C(sslunknowncert)
 C(sslupgrades)
 C(sslverifyfailed)
+C(stackuse)
 C(statfails)
 C(staticrequests)
 C(stats)