[Bug bootstrap/60719] With --program-prefix=$target_alias --program-suffix=-$version install-driver breaks

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60719

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Guarding the two seemingly slightly different cases with
  "$(GCC_INSTALL_NAME)" != "$(target_noncanonical)-gcc-$(version)"
and
  "$(GCC_INSTALL_NAME)" != "$(GCC_TARGET_INSTALL_NAME)"
would work, but this is clearly very much a mess.