gcc/ libiberty.a make dependancies broken?

[DJ Delorie]

> gmake: *** No rule to make target `../libiberty/libiberty.a', needed by `gengenrtl'.  Stop.

Intentional.  We added support for a build-side libiberty, and the
gen* programs link with it.  You must build the build-libiberty before
any of the gen* programs.

*Which* libiberty to build differs depending on the build; if
build==host, it's ../libiberty.  If build!=host, it's
../$build/libiberty.