patch 9.0.1019: 'smoothscroll' and virtual text above don't work together

Problem:    'smoothscroll' and virtual text above don't work together.
            (Yee Cheng Chin)
Solution:   Skip virtual text above when w_skipcol is non-zero.
            (closes #11665)
diff --git a/src/proto/drawline.pro b/src/proto/drawline.pro
index 5dc2031..fc6fb88 100644
--- a/src/proto/drawline.pro
+++ b/src/proto/drawline.pro
@@ -1,4 +1,4 @@
 /* drawline.c */
-int text_prop_position(win_T *wp, textprop_T *tp, int vcol, int scr_col, int *n_extra, char_u **p_extra, int *n_attr, int *n_attr_skip);
+int text_prop_position(win_T *wp, textprop_T *tp, int vcol, int scr_col, int *n_extra, char_u **p_extra, int *n_attr, int *n_attr_skip, int do_skip);
 int win_line(win_T *wp, linenr_T lnum, int startrow, int endrow, int nochange, int number_only);
 /* vim: set ft=c : */