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/emacs/cosmo-c-builtins.el

@@ -45,6 +45,8 @@
            "__INTMAX_C"
            "__UINTMAX_C"
            "__TIMESTAMP__"
+           "__SANITIZE_ADDRESS__"
+           "__SANITIZE_UNDEFINED__"
            "__FP_FAST_FMA"
            "__FP_FAST_FMAF"
            "__FP_FAST_FMAL"