Also set CT_DEBUGROOT_DIR for non sysroot-ed toolchains.
In the non-sysroot-ed case, the debuf-root directory would not be set;
debug tools would have been installed God-only-knows-where...
Spotted by Bart van der Meulen <bartvdrmeulen@gmail.com>.
(transplanted from 634ffd14d936154464fd714ed29ed44c8e16ae02)
1 reporter_name="Julien DUSSER"
2 reporter_url="http://sourceware.org/ml/crossgcc/2008-10/msg00054.html"
3 reporter_comment="Soft-float for the 405 PowerPC"