[Chicken-users] Fix for here docs with #<#

[Reed Sheridan]

Here documents with the #<# syntax fail with large inputs, because it creates a list of tokens and calls ##sys#print-to-string on them.  When there are more than, what is it, 126 tokens, it fails.  A fix is attached, which changes ##sys#print-to-string to a unary procedure and changes every call to it to reflect this (all two of them).

Reed Sheridan

here-doc-fix.patch
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