fix makefile in phpize mode

- extend LDFLAGS with dynamically generated ones
- prevend dynamically generated CFLAGS to be overridden by hardcoded ones
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  fix makefile in phpize mode
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  fix makefile in phpize mode
Merge branch 'PHP-5.6'

* PHP-5.6:
  fix makefile in phpize mode