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.

third_party/quickjs/qjsc.c

@@ -488,6 +488,11 @@ int main(int argc, char **argv)
     BOOL bignum_ext = FALSE;
 #endif
     namelist_t dynamic_module_list;
+
+#if IsModeDbg()
+    ShowCrashReports();
+#endif
+
     if (argc == 2 && !strcmp(argv[1], "-n")) return 0;
     out_filename = NULL;
     output_type = OUTPUT_EXECUTABLE;