[tlbuild] sharable format files

[Akira Kakuto]

Karl Berry wrote:

... ... 
> wget http://tug.org/~karl/sharable-tex.fmt.gz
> gunzip sharable-tex.fmt.gz
> tex \&./sharable-tex \\end
> 
>    If you don't get the dreaded "Fatal format error", it is good.

bin/win32/tex.exe is ok.

Best regards,
Akira Kakuto