configure.info: CCross not in Cygnus Tree

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Canadian Cross not in Cygnus Tree.

   If you are not using the Cygnus tree, you must explicitly specify the
cross tools which you want to use to build the program.  This is done by
setting environment variables before running the `configure' script.
   You must normally set at least the environment variables `CC', `AR',
and `RANLIB' to the cross tools which you want to use to build.
   For some programs, you must set additional cross tools as well, such
as `AS', `LD', or `NM'.
   You would set these environment variables to the build cross tools
which you are going to use.
   For example, if you are building a Solaris program on a GNU/Linux
system, and your GNU/Linux cross Solaris compiler were named
`solaris-gcc', then you would set the environment variable `CC' to
`solaris-gcc'.