[CS6] Add srfi-37

Hi!

I am currently in the process of porting my existing CS5 code to CS6.
While doing so, I noticed that the srfi-37 egg is not yet available for
CS6. However, the existing code compiles and works fine with CS6 as well.

Would it be possible to add srfi-37 to the CS6 index?

Cheers,
Sören