Fix anonymous struct usage

ziglang/zig#21817

Author: bobf

src/zmd/tokens.zig

@@ -66,23 +66,12 @@ pub const elements = [_]Element{
     .{ .type = .ordered_list_item, .syntax = "1. ", .close = .linebreak, .clear = true },
 };
 
-pub const toggles = if (@hasDecl(std, "ComptimeStringMap"))
-    std.ComptimeStringMap(
-        Element,
-        .{
-            .{ "code", .{ .type = .code_close, .syntax = "`" } },
-            .{ "block", .{ .type = .block_close, .syntax = "```" } },
-        },
-    )
-else if (@hasDecl(std, "StaticStringMap"))
-    std.StaticStringMap(Element).initComptime(
-        .{
-            .{ "code", .{ .type = .code_close, .syntax = "`" } },
-            .{ "block", .{ .type = .block_close, .syntax = "```" } },
-        },
-    )
-else
-    unreachable;
+pub const toggles = std.StaticStringMap(Element).initComptime(
+    .{
+        .{ "code", Element{ .type = .code_close, .syntax = "`" } },
+        .{ "block", Element{ .type = .block_close, .syntax = "```" } },
+    },
+);
 
 pub const formatters = [_]Element{
     .{ .type = .bold, .syntax = "**", .close = .bold_close },