[Buildroot] CodeSourcery moved to Mentor Graphics

[Jerry Jacobs]

Dear All,

I tried to create a new configuration for the Ledato NanosG20 
(AT91SAM9G20) with the codesourcery toolchain. But it was not able to 
download the toolchain (Using latest buildroot from GIT). We should 
point the new download links to:

http://www.mentor.com/embedded-software/sourcery-tools/sourcery-codebench/lite-edition

Kind regards,
Jerry Jacobs
- http://xor-gate.org