Revert r774755: ap_server_root_relative() for

piped loggers is nonsense. It doesn't work when
the logger path contains whitespace.

We already allow relative paths because we open
the log program via the shell.

Code was taken from mod_rewrite and mod_log_forensic,
which need to be still fixed (removing
ap_server_root_relative() should suffice).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@774884 13f79535-47bb-0310-9956-ffa450edef68