Fix 5.5.10 NEWS

The FPM change didn't make it into 5.5.10 but will instead be in 5.5.11; http://php.net/Changelog-5.php, the release and the NEWS file in the release accurately reflect this, but the 5.5 branch NEWS doesn't (as the release was made and tagged from the last RC, which didn't contain that change yet).
Fixed Bug #66833 Default digest algo is still MD5

Switch to SHA1, which match internal openssl hardcoded algo.

In most case, won't even be noticed
- priority on user input (default_md)
- fallback on system config
- fallback on this default value

Recent system reject MD5 digest, noticed in bug36732.phpt failure.

While SHA1 is better than MD5, SHA256 is recommenced,
and defined as default algo in provided configuration on
recent system (Fedora 21, RHEL-7, ...). But the idea is to
keep in sync with openssl internal value for PHP internal value.
NEWS
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  NEWS
  Fixed Bug #66833 Default digest algo is still MD5
NEWS
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  NEWS
  NEWS
  Fixed Bug #66833 Default digest algo is still MD5
  Fix 5.5.10 NEWS
NEWS