Several changes in PTLib have occurred requiring build time detection. Changes
accounted for include the library name change, config option change, install
location change, and a boolean type change which is handled by ast_ptlib.h.
Also, the sed check has been modified to properly work with autoconf >= 2.62.

(closes issue #14224)
Reported by: bergolth
Patches:
      asterisk-autoconf-sed.patch uploaded by bergolth (license 661)
      asterisk-pwlib-v3.patch uploaded by bergolth (license 661)
Tested by: jpeeler


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@177162 65c4cc65-6c06-0410-ace0-fbb531ad65f3