Update Installation/Linux/CentOS/build_mono.sh
Update Installation/Linux/CentOS/build_mono.sh

Added a few more dependencies that Coleman found while installing on CentOS 5.6

Mainly, the libgdiplus build was dying because some of the graphics libraries didn't have their respective -devel packages. On CentOS 6.2, this seemed to be fine as that support was weeded out by the configure script. Oh well.
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