undef previous definition of `SIZEOF_STRUCT_STAT_ST_INO`

trying to solve build problem of MinGW.  see [Bug #14165]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61119 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

include/ruby/win32.h

@@ -194,6 +194,7 @@ struct stati128 {
 #if SIZEOF_OFF_T == 8
 #define off_t __int64
 #define stat stati128
+#undef SIZEOF_STRUCT_STAT_ST_INO
 #define SIZEOF_STRUCT_STAT_ST_INO sizeof(unsigned __int64)
 #define HAVE_STRUCT_STAT_ST_INOHIGH
 #define HAVE_STRUCT_STAT_ST_ATIMENSEC