Add needed functions to glibc-compat for pkg

ports/libxcb/nacl.patch

 diff --git a/configure b/configure
 --- a/configure
 +++ b/configure
-@@ -13123,7 +13123,9 @@ else
+@@ -13123,7 +13136,9 @@ else
  $as_echo "yes" >&6; }
  
  fi
 -NEEDED="pthread-stubs xau >= 0.99.2"
 +# Dropped pthread-stubs since for nacl we can always build against pthreads.
 +# This avoids an unused package.
 +NEEDED="xau >= 0.99.2"
  
  pkg_failed=no
  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NEEDED" >&5
@@ skipping 20 matching lines @@
 +  va_end(ap);
 +  return rtn;
 +}
 +#define fcntl nacl_fcntl
 +#endif
 +
 +
  static int set_fd_flags(const int fd)
  {
  /* Win32 doesn't have file descriptors and the fcntl function. This block sets the socket in non-blocking mode */
-@@ -179,7 +199,8 @@ static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
-     int n;
-     assert(!c->out.queue_len);
- 
--#ifdef _WIN32
-+    /* Using writev emulation for nacl newlib. */
-+#if defined(_WIN32) || (defined(__native_client__) && defined(_NEWLIB_VERSION))
-     int i = 0;
-     int ret = 0,err = 0;
-     struct iovec *vec;
-@@ -190,11 +211,26 @@ static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
-     vec = *vector;
-     while(i < *count)
-     {           
--         ret = send(c->fd,vec->iov_base,vec->iov_len,0);        
-+         /*
-+          * TODO(bradnelson): Drop if nacl_io supports zero length sends.
-+          *     https://code.google.com/p/naclports/issues/detail?id=228
-+          */
-+         if (vec->iov_len != 0) {
-+           ret = send(c->fd,vec->iov_base,vec->iov_len,0);
-+         } else {
-+           ret = 0;
-+         }
-+         /* Generalize to posix so this can be used with nacl newlib. */
-+#if defined(__native_client__) && defined(_NEWLIB_VERSION)
-+         if(ret < 0)
-+         {
-+             if(errno == EWOULDBLOCK)
-+#else
-          if(ret == SOCKET_ERROR)
-          {
-              err  = WSAGetLastError();
-              if(err == WSAEWOULDBLOCK)
-+#endif
-              {
-                  return 1;
-              }