Restart CI for New Technology and UBSAN hunting

Continuous Integration (via runit and runitd) is now re-enabled on win7
and win10. The `make test` command, which runs the tests on all systems
is now the fastest and most stable it's been since the project started.

UBSAN is now enabled in MODE=dbg in addition to ASAN. Many instances of
undefined behavior have been removed. Mostly things like passing a NULL
argument to memcpy(), which works fine with Cosmopolitan Libc, but that
doesn't prevents the compiler from being unhappy. There was an issue w/
GNU make where static analysis claims a sprintf() call can overflow. We
also now have nicer looking crash reports on Windows since uname should
now be supported and msys64 addr2line works reliably.

tool/viz/printvideo.c

@@ -1536,7 +1536,7 @@ int main(int argc, char *argv[]) {
   sigaddset(&wut, SIGCHLD);
   sigaddset(&wut, SIGPIPE);
   sigprocmask(SIG_SETMASK, &wut, NULL);
-  showcrashreports();
+  ShowCrashReports();
   fullclear_ = true;
   GetOpts(argc, argv);
   if (!tuned_) PickDefaults();