From: Henrik Nordstrom <hno@hem.passagen.se>

From:    Henrik Nordstrom <hno@hem.passagen.se>
* Symlink destinations in FTP listings
* @SQUID_PTHREAD_LIB@ and not @PTHREADLIB@ when linking squid, to only
  link in -lpthreads when async-io is used.
* --enable-kill-parent-hack instead of --enable-kill-parent

New changes

* -D_REENTRANT when compiling with pthreads (--enable-async-io)
* Disable use of SIGUSR1,2 when using linuxthreads (-lpthreads on linux)
  linuxthreads uses these two signals internally, since there is no
  other available signals to use..