checker: rewrite comptime_if_cond() to support comptime if cond evaluate (fix #24938) (fix #25099) (#25122)

Author: kbkpbot

vlib/v/checker/checker.v

@@ -100,8 +100,8 @@ pub mut:
 	smartcast_mut_pos           token.Pos // match mut foo, if mut foo is Foo
 	smartcast_cond_pos          token.Pos // match cond
 	ct_cond_stack               []ast.Expr
-	ct_user_defines             map[string]ComptimeBranchSkipState
-	ct_system_defines           map[string]ComptimeBranchSkipState
+	ct_user_defines             map[string]bool
+	ct_system_defines           map[string]bool
 mut:
 	stmt_level int // the nesting level inside each stmts list;
 	// .stmt_level is used to check for `evaluated but not used` ExprStmts like `1 << 1`