lib.a in tools/env

[rich_ogrady at grayhill.com]

Hello,

It seems that lib.a doesn't get built correctly (at least for us) since 
u-boot-2020.10.  In later versions the file is there in the folder but is 
rather small and unidentifiable as a valid archive.
We build with options tools-only_defconfig, envtools, and NO_SDL=1

Any ideas?

Regards,
Rich