Ensure execinfo.h and linker flags set in autoconf (#3098)
Ensure execinfo.h and linker flags set in autoconf (#3098)

* Ensure execinfo.h and linker flags set in autoconf

* Only check for backtrace() if not Windows

nmarley/dash,ionomy/ion,UdjinM6/dash,ionomy/ion,UdjinM6/dash,dashpay/dash,ionomy/ion,thelazier/dash,nmarley/dash,ionomy/ion,UdjinM6/dash,dashpay/dash,dashpay/dash,UdjinM6/dash,nmarley/dash,dashpay/dash,thelazier/dash,dashpay/dash,ionomy/ion,UdjinM6/dash,thelazier/dash,nmarley/dash,ionomy/ion,nmarley/dash,nmarley/dash,nmarley/dash,thelazier/dash,thelazier/dash