Make redbean StoreAsset() work better

- Better UBSAN error messages
- POSIX Advisory Locks polyfills
- Move redbean manual to /.help.txt
- System call memory safety in ASAN mode
- Character classification now does UNICODE

libc/log/log.h

@@ -1,5 +1,6 @@
 #ifndef COSMOPOLITAN_LIBC_LOG_LOG_H_
 #define COSMOPOLITAN_LIBC_LOG_LOG_H_
+#include "libc/bits/likely.h"
 #include "libc/calls/struct/sigset.h"
 #include "libc/calls/struct/winsize.h"
 #include "libc/stdio/stdio.h"