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>.
1 reporter_name="Yann E. MORIN"
2 reporter_url="http://ymorin.is-a-geek.org/"
3 reporter_comment="This toolchain is pre-configured to target the BeagleBoard: http://beagleboard.org/"