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 This is NOT the official version of dialog. This version has been
2 significantly modified from the original. It is for use by the Linux
3 kernel configuration script. Please do not bother Savio Lam with
4 questions about this program.