[cgiapp] calling header_props multiple times (patch)

[Cees Hek <suppressed>]

I have a need in my CGI::Application modules to call header_props multiple times
in one request.  This currently doesn't work, as a second call to header_props
currently clobbers any previous data.

The following simple patch alters this by merging the data for any repeat calls
to header_props.

I use this functionality for setting Cookies in the cgiapp_prerun hook (for
authentication), but then I may want to call a redirect or change the
content-type later in the code in one of the run modes.

Cees

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