Add epoll and do more release readiness changes

This change also pays off some of the remaining technical debt with
stdio, file descriptors, and memory managemnt polyfills.

libc/sock/accept-nt.c

@@ -22,6 +22,7 @@
 #include "libc/nt/files.h"
 #include "libc/nt/winsock.h"
 #include "libc/sock/internal.h"
+#include "libc/sock/yoink.inc"
 #include "libc/sysv/consts/fio.h"
 #include "libc/sysv/consts/sock.h"
 #include "libc/sysv/errfuns.h"
@@ -31,20 +32,20 @@ textwindows int accept$nt(struct Fd *fd, void *addr, uint32_t *addrsize,
   int client;
   uint32_t yes;
   assert(fd->kind == kFdSocket);
-  if ((client = createfd()) == -1) return -1;
+  if ((client = __getemptyfd()) == -1) return -1;
   if ((g_fds.p[client].handle = WSAAccept(fd->handle, addr, (int32_t *)addrsize,
                                           NULL, NULL)) != -1) {
     if (flags & SOCK_NONBLOCK) {
       yes = 1;
       if (__ioctlsocket$nt(g_fds.p[client].handle, FIONBIO, &yes) == -1) {
         __closesocket$nt(g_fds.p[client].handle);
-        return winsockerr();
+        return __winsockerr();
       }
     }
     g_fds.p[client].kind = kFdSocket;
     g_fds.p[client].flags = flags;
     return client;
   } else {
-    return winsockerr();
+    return __winsockerr();
   }
 }