Make improvements

- Polyfill pselect() on Windows
- Add -O NOFILE flag to pledge.com
- Polyfill ppoll() on NetBSD, XNU, and Windows
- Support negative numbers and errno in sizetol()
- Add .RSS, .NOFILE, and .MAXCORE to Landlock Make
- Fix issue with .PLEDGE preventing touching of output files
- Add __watch() function (like ftrace) for logging memory changes

libc/log/log.h

@@ -36,6 +36,7 @@ COSMOPOLITAN_C_START_
 
 extern FILE *__log_file;
 
+int __watch(void *, size_t);
 void __die(void) relegated wontreturn; /* print backtrace and abort() */
 void meminfo(int);                     /* shows malloc statistics &c. */
 void memsummary(int);                  /* light version of same thing */