This fixes the problem compiling gdb with latest mingw64 library (trunk).

* ETIMEDOUT is already defined in mingw64.

=================================================

diff --git a/gdb/ser-tcp.c b/gdb/ser-tcp.c
index e3d5640..4f2dcdd 100644
--- a/gdb/ser-tcp.c
+++ b/gdb/ser-tcp.c
@@ -39,7 +39,9 @@

 #ifdef USE_WIN32API
 #include <winsock2.h>
+#ifndef ETIMEDOUT
 #define ETIMEDOUT WSAETIMEDOUT
+#endif
 #define close(fd) closesocket (fd)
 #define ioctl ioctlsocket
 #else