patch 8.1.0083: "is" and "as" have trouble with quoted punctuation

Problem:    "is" and "as" have trouble with quoted punctuation.
Solution:   Check for punctuation before a quote. (Jason Franklin)

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    83,
 /**/
     82,
 /**/