fix: align POSIX stdio and argument handling, clarify Intel iwlwifi licensing

programs/include/libc/stdlib.h

@@ -39,8 +39,8 @@ double atof(const char *s);
 int    abs(int j);
 long   labs(long j);
 
-void   exit(int status);
-void   abort(void);
+void   exit(int status) __attribute__((noreturn));
+void   abort(void) __attribute__((noreturn));
 int    atexit(void (*func)(void));
 
 char  *getenv(const char *name);