patch 9.0.0880: preprocessor indenting is off

Problem:    Preprocessor indenting is off.
Solution:   Adjust preprocessor indentation. (Ken Takata, closes #11546)
diff --git a/src/cindent.c b/src/cindent.c
index 15b459c..105e08c 100644
--- a/src/cindent.c
+++ b/src/cindent.c
@@ -4145,11 +4145,11 @@
     void
 do_c_expr_indent(void)
 {
-# ifdef FEAT_EVAL
+#ifdef FEAT_EVAL
     if (*curbuf->b_p_inde != NUL)
 	fixthisline(get_expr_indent);
     else
-# endif
+#endif
 	fixthisline(get_c_indent);
 }