buildman: Add gcc 4.9.0 with Microblaze toolchain

Also read gcc 4.9.0 at kernel.org which also have Microblaze toolchain.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>

Fixed unit test failure by updating the test:
Signed-off-by: Simon Glass <sjg@chromium.org>