vim-patch:8.0.0451: some macros are in lower case

Problem:    Some macros are in lower case.
Solution:   Make a few more macros upper case. Avoid lower case macros use an
            argument twice.
91acfffc1e

src/nvim/mouse.c

@@ -525,7 +525,7 @@ static colnr_T scroll_line_len(linenr_T lnum)
   if (*line != NUL) {
     for (;;) {
       int numchar = chartabsize(line, col);
-      mb_ptr_adv(line);
+      MB_PTR_ADV(line);
       if (*line == NUL) {    // don't count the last character
         break;
       }