patch 8.1.1971: manually enabling features causes build errors

Problem:    Manually enabling features causes build errors. (John Marriott)
Solution:   Adjust #ifdefs.
diff --git a/src/ui.c b/src/ui.c
index a072359..1b700f1 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -3637,6 +3637,8 @@
 	|| defined(FEAT_GUI_ATHENA) || defined(FEAT_GUI_MSWIN) \
 	|| defined(FEAT_GUI_PHOTON) || defined(FEAT_TERM_POPUP_MENU) \
 	|| defined(PROTO)
+# define NEED_VCOL2COL
+
 /*
  * Translate window coordinates to buffer position without any side effects
  */
@@ -3678,10 +3680,8 @@
 }
 #endif
 
-#if defined(FEAT_GUI_MOTIF) || defined(FEAT_GUI_GTK) || defined(FEAT_GUI_MAC) \
-	|| defined(FEAT_GUI_ATHENA) || defined(FEAT_GUI_MSWIN) \
-	|| defined(FEAT_GUI_PHOTON) || defined(FEAT_BEVAL) \
-	|| defined(FEAT_TERM_POPUP_MENU) || defined(PROTO)
+#if defined(NEED_VCOL2COL) || defined(FEAT_BEVAL) || defined(FEAT_TEXT_PROP) \
+	|| defined(PROTO)
 /*
  * Convert a virtual (screen) column to a character column.
  * The first column is one.