refactor: the long goodbye

long is 32 bits on windows, while it is 64 bits on other architectures.
This makes the type suboptimal for a codebase meant to be
cross-platform. Replace it with more appropriate integer types.

src/nvim/spell.c

@@ -2683,7 +2683,7 @@ void ex_spellrepall(exarg_T *eap)
   sub_nlines = 0;
   curwin->w_cursor.lnum = 0;
   while (!got_int) {
-    if (do_search(NULL, '/', '/', frompat, 1L, SEARCH_KEEP, NULL) == 0
+    if (do_search(NULL, '/', '/', frompat, 1, SEARCH_KEEP, NULL) == 0
         || u_save_cursor() == FAIL) {
       break;
     }