updated for version 7.4.644

Problem:    Stratus VOS doesn't have sync().
Solution:   Use fflush(). (Karli Aurelia)

src/memfile.c

@@ -639,7 +639,8 @@ mf_sync(mfp, flags)
 # endif
 	    /* OpenNT is strictly POSIX (Benzinger) */
 	    /* Tandem/Himalaya NSK-OSS doesn't have sync() */
-# if defined(__OPENNT) || defined(__TANDEM)
+	    /* No sync() on Stratus VOS */
+# if defined(__OPENNT) || defined(__TANDEM) || defined(__VOS__)
 	    fflush(NULL);
 # else
 	    sync();

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    644,
 /**/
     643,
 /**/