[glib] Fix duplicated case value for mingw runtimes defining EOVERLFOW as EFBIG

[Sebastian DrÃge <sdroege src gnome org>]

commit 97385dbbe82a628a9997ed85e6c9f58dddf334d0
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Wed Nov 28 16:34:18 2012 +0100

    Fix duplicated case value for mingw runtimes defining EOVERLFOW as EFBIG

 glib/giochannel.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/glib/giochannel.c b/glib/giochannel.c
index 9e9c1cb..d345773 100644
--- a/glib/giochannel.c
+++ b/glib/giochannel.c
@@ -824,9 +824,11 @@ g_io_channel_error_from_errno (gint en)
 #endif
 
 #ifdef EOVERFLOW
+#if EOVERFLOW != EFBIG
     case EOVERFLOW:
       return G_IO_CHANNEL_ERROR_OVERFLOW;
 #endif
+#endif
 
 #ifdef EPIPE
     case EPIPE: