Update build_linux.md to reflect changes needed for 32 bit Ubuntu 14.04
7. On Debian 7 and Ubuntu 14.04 only: Install CodeSynthesis XSD:
1. `wget http://www.codesynthesis.com/download/xsd/4.0/linux-gnu/x86_64/xsd_4.0.0-1_amd64.deb`
+ - (Use http://codesynthesis.com/download/xsd/4.0/linux-gnu/i686/xsd_4.0.0-1_i386.deb if installing on a 32 bit machine)
2. `sudo dpkg -i --force-all xsd_4.0.0-1_amd64.deb`
+ - (`sudo dpkg -i --force-all xsd_4.0.0-1_i386.deb` on a 32 bit machine)
3. `sudo apt-get install -f`
This step is needed because we require xsd version 4.0.
(When mono-devel is updated, you will need to manually remove then reinstall xsd as above, because of the package conflicts.)
