[FASTCGI] Content-Length header should be set using ap_set_content_length

[Artur Zaprzała]

Content-Length header should be set using ap_set_content_length() function in 
process_headers(). I fixed this about 3 years ago and I don't remember what was 
the problem with the current aproach, but it surely was.

Today I did some research to support my fix.

Currently process_headers() adds Content-Length to err_headers_out. Here is 
description of err_headers_out from Apache documentation:
> The difference between headers_out and err_headers_out is that the latter are printed even on error, and persist across internal redirects (so the headers printed for ErrorDocument handlers will have them).

And Content-Length shouldn't persist across internal redirects.
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