fix comptime if statement

src/os/hostname.zig

@@ -48,7 +48,7 @@ pub fn parseUrl(url: []const u8) UrlParsingError!std.Uri {
     return std.Uri.parse(url) catch |e| {
         // The mac-address-as-hostname issue is specific to macOS so we just return an error if we
         // hit it on other platforms.
-        comptime if (builtin.os.tag != .macos) return e;
+        if (comptime builtin.os.tag != .macos) return e;
 
         // It's possible this is a mac address on macOS where the last 2 characters in the
         // address are non-digits, e.g. 'ff', and thus an invalid port.