Exception handler (Unix): Install a handler for SIGSEGV (#552)
Exception handler (Unix): Install a handler for SIGSEGV (#552)

test-exception now passes on FreeBSD11/amd64, OpenBSD6/amd64.

Closes #551
wxsBSD/yara,rednaga/yara,tanium/yara,pombredanne/yara,pombredanne/yara,kallanreed/yara,pombredanne/yara,jpypi/yara,plusvic/yara,kallanreed/yara,wxsBSD/yara,cblichmann/yara,tanium/yara,kallanreed/yara,wxsBSD/yara,VirusTotal/yara,VirusTotal/yara,wxsBSD/yara,tanium/yara,VirusTotal/yara,plusvic/yara,hillu/yara,hillu/yara,cblichmann/yara,jpypi/yara,MeteorAdminz/yara,plusvic/yara,cblichmann/yara,VirusTotal/yara,hillu/yara,rednaga/yara,rednaga/yara,plusvic/yara,VirusTotal/yara,MeteorAdminz/yara,plusvic/yara,cblichmann/yara,hillu/yara,pombredanne/yara,MeteorAdminz/yara,cblichmann/yara,wxsBSD/yara,pombredanne/yara,hillu/yara,jpypi/yara