[Mod_log_sql] patch to work with X-Forwarded-For and mod_vhs HTTP header

[Rene Kanzler]

Hello
I have created a small patch to get mod_log_sql working with
X-Forwarded-For and mod_vhs HTTP header.
The new characters in the log format-string are "x" and "g".
To log real IP adresses behind a proxy replace "h" with "x" in your log
format-string.
If no X-Forwarded-For HTTP header is found the remote IP address will be
logged.
mod_vhs users should replace "v" or "V" with "g" according to the manual at
http://openvisp.fr/doku/doku.php?id=mod_vhs:logs
If the mod_vhs HTTP header is not found the virtual host name will be
logged.

This patch is against mod_log_sql version 1.100
This patch is only tested with Apache 2.2.x

Hopefully somebody finds this useful. 
The patch is attached ;-) 

Cheers Rene
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