vim-patch:8.2.4773: build failure without the +eval feature

Problem:    Build failure without the +eval feature.
Solution:   Use other error message.  Avoid warnings.

https://github.com/vim/vim/commit/a9549c9e8f368a7fa1dcbe14ec23e82c6a0b8715

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

src/nvim/indent_c.c

@@ -559,7 +559,7 @@ static int cin_isdefault(const char *s)
          && s[1] != ':';
 }
 
-/// Recognize a scope declaration label set in 'cinscopedecls'.
+/// Recognize a scope declaration label from the 'cinscopedecls' option.
 static bool cin_isscopedecl(const char *p)
 {
   const char *s = cin_skipcomment(p);