Patch: add ByteString.Unsafe.unsafePackMallocCStringLen

[Lauri Alanko]

Hello.

There's a minor lapse in Data.ByteString.Unsafe:  
unsafePackMallocCString, unlike the other unsafePack* -functions,  
doesn't have a variant with an explicit length. This is useful when  
interfacing with C libraries that return a blob of binary data that  
the caller must free. Attached is a darcs patch that adds it.


Lauri

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