vim-patch:9.0.0634: evaluating "expr" options has more overhead than needed

Problem:    Evaluating "expr" options has more overhead than needed.
Solution:   Use call_simple_func() for 'foldtext', 'includeexpr', 'printexpr',
            "expr" of 'spellsuggest', 'diffexpr', 'patchexpr', 'balloonexpr',
            'formatexpr', 'indentexpr' and 'charconvert'.

a4e0b9785e

vim-patch:9.0.0635: build error and compiler warnings

Problem:    Build error and compiler warnings.
Solution:   Add missing change.  Add type casts.

3292a22940

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/eval/vars.c

@@ -89,7 +89,7 @@ char *eval_one_expr_in_str(char *p, garray_T *gap, bool evaluate)
   }
   if (evaluate) {
     *block_end = NUL;
-    char *expr_val = eval_to_string(block_start, false);
+    char *expr_val = eval_to_string(block_start, false, false);
     *block_end = '}';
     if (expr_val == NULL) {
       return NULL;