Generates a string for the name of a tool as it was configured and
installed, given its native name (as the argument toolname).
This makes the assumption that all tools are installed using the same
naming conventions: For example, for a cross compiler supporting the
m68k-vxworks configuration, the result of transform gcc
is m68k-vxworks-gcc.
transform toolname
toolnameThe name of the cross-development program to transform.