Add 'relativenumber' patch from Markus Heidelberg.
diff --git a/src/misc1.c b/src/misc1.c
index d476f31..69bfe7d 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -1742,7 +1742,7 @@
 	col += 1;
 
     /*
-     * Add column offset for 'number' and 'foldcolumn'.
+     * Add column offset for 'number', 'relativenumber' and 'foldcolumn'.
      */
     width = W_WIDTH(wp) - win_col_off(wp);
     if (width <= 0)
@@ -1803,7 +1803,7 @@
 	col += win_lbr_chartabsize(wp, s, (colnr_T)col, NULL) - 1;
 
     /*
-     * Add column offset for 'number', 'foldcolumn', etc.
+     * Add column offset for 'number', 'relativenumber', 'foldcolumn', etc.
      */
     width = W_WIDTH(wp) - win_col_off(wp);
     if (width <= 0)