Tango built as a dynamic library

[Walter Bright]

Jacob Carlborg wrote:
> I've managed to build Tango as a dynamic library with DMD on Mac OS X. I 
> had some problems first but I managed to solve them and everything seems 
> to work now.

Thanks for doing this.

In the next update, I plan to remove the special deh sections, and instead make 
the EH tables available through the ModuleInfo. This should simplify the 
management of multiple sections, as the only data structure that needs to be 
aggregated will be the ModuleInfo array.