Add ifdef on ecdh for single_ecdh_use

Allows build with OpenSSL < 0.9.8
Update NEWS for PR#723 merge
Merge branch 'PHP-5.6'
Fix my name in the given credit
Add some trace info as well as update CLIENT_ flags
Merge branch 'PHP-5.6'

Conflicts:
	NEWS
Merge branch 'master' of git://github.com/php/php-src