[Bug bootstrap/122924] make install after make bootstrap2 missed dlang's std when make boostrap works as expected

[kirill at korins dot ky via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122924

--- Comment #4 from Kirill A. Korinsky <kirill at korins dot ky> ---
(In reply to Sam James from comment #3)
> 
> Why are they rebuilt? If it is with different kernel/libc, there is value?
> 

This is one of possibilites, yes.

> 
> You can use --disable-bootstrap in configure instead.
>

Anyway, it is a workaround to a bug that bootstrap2 can't produce working gdc.