[PATCH v1] env: Fix compile error for envtools

[Jacky.Cao at sony.com]

> > I use master branch of OSS u-boot repo and meet the issue with below
> > commands:
> >
> > make mx6qsabrelite_defconfig
> > make -j8
> > make tools envtools
> 
> What host distribution are you building on? And, <config.h> *must* come first
> in the include list, for it to function correctly.

Host OS is Ubuntu 22.04.3 LTS.
Toolchain is Arm GNU Toolchain 11.3.Rel1(arm-none-linux-gnueabihf-).
Also tried Ubuntu 24.04.4 LTS and Arm GNU Toolchain 15.3.Rel1,
the issue still happens.