include/port.h: fix a compiler warning on OpenSolaris

[Austin English]

OpenSolaris defines _FILE_OFFSET_BITS as well, causing a conflict.

-- 
-Austin
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diff --git a/include/wine/port.h b/include/wine/port.h
index 817f02b..04f0486 100644
--- a/include/wine/port.h
+++ b/include/wine/port.h
@@ -29,6 +29,9 @@
 # error You must include port.h before all other headers
 #endif
 
+#ifdef _FILE_OFFSET_BITS
+#undef _FILE_OFFSET_BITS /* causes a conflict on Solaris */
+#endif
 #define _FILE_OFFSET_BITS 64
 #define _GNU_SOURCE  /* for pread/pwrite */
 #include <fcntl.h>