SERVER-6414 - windows compile part 3

Author: erh

src/mongo/db/extsort.cpp

@@ -290,7 +290,7 @@ namespace mongo {
         long long total = 0;
         while ( total < count ) {
 #ifdef _WIN32
-            long long now = _read( _file, buf, count );
+            long long now = ::_read( _file, buf, count );
 #else
             long long now = ::read( _file, buf, count );
 #endif