Fix build with --disable-fading --enable-perl.
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Fix regression in 2013-03-27 change that broke continuous scrolling when
pressing and holding the scrollbar up or down button, gentoo bug #493992.
Fix temp file location.
Enable PTYTTY_REENTRANT.

Without it urxvtd is unable to write utmp entries when using --fork, as
the running process is not the parent of the ptytty helper process.
Revert last change.

ptytty::create now uses the helper regardless of the pid of the running
process.
Update Changes.
Robert Wittek
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