Add an entry for bug#66060 (fixed in 5.5.8)
Use #66356 instead of #66714, as the latter is only a regression fix from the former.
Align entiries format to "Fixed bug #..."
Add missing CVE IDs for 5.6.0
Merge branch 'PHP-5.6'

* PHP-5.6:
  Add missing CVE IDs for 5.6.0
  Align entiries format to "Fixed bug #..."
  Use #66356 instead of #66714, as the latter is only a regression fix from the former.
  Add an entry for bug#66060 (fixed in 5.5.8)
exclude log2 usage which requires C99 support