patch 8.1.1635: warnings for unused variables in small version

Problem:    Warnings for unused variables in small version. (John Marriott)
Solution:   Adjust #ifdefs.

Author: brammool

src/screen.c

@@ -3265,11 +3265,13 @@ win_line(
 #endif
 #if defined(FEAT_SIGNS) || defined(FEAT_QUICKFIX) \
 	|| defined(FEAT_SYN_HL) || defined(FEAT_DIFF)
-    int		sign_present = FALSE;
-    sign_attrs_T sattr;
 # define LINE_ATTR
     int		line_attr = 0;		/* attribute for the whole line */
 #endif
+#ifdef FEAT_SIGNS
+    int		sign_present = FALSE;
+    sign_attrs_T sattr;
+#endif
 #ifdef FEAT_SEARCH_EXTRA
     matchitem_T *cur;			/* points to the match list */
     match_T	*shl;			/* points to search_hl or a match */

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1635,
 /**/
     1634,
 /**/