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/qjs.c

@@ -24,6 +24,7 @@
  */
 #include "libc/assert.h"
 #include "libc/calls/weirdtypes.h"
+#include "libc/dce.h"
 #include "libc/log/log.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
@@ -328,6 +329,10 @@ int main(int argc, char **argv)
 #endif
     size_t stack_size = 0;
 
+#if IsModeDbg()
+    ShowCrashReports();
+#endif
+
 #ifdef CONFIG_BIGNUM
     /* load jscalc runtime if invoked as 'qjscalc' */
     {