Add "win" alias for "win32" output format

We already have "elf" and "macho" aliases for respective
32 bit output formats. Make the same for "win32" in a
sake of consistency.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

output/outform.h

@@ -348,6 +348,13 @@ static struct ofmt_alias {
         "MACHO (short name for MACHO32)",
         &of_macho32,
     },
+#endif
+#ifdef OF_WIN32
+    {
+        "win",
+        "WIN (short name for WIN32)",
+        &of_win32,
+    },
 #endif
     { NULL, NULL, NULL }
 };