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[libxml] Unit test for libxml_disable_entity_loader()

Summary:
Test to make sure libxml_disable_entity_loader() is behaving.
imagettftext() uses the last charactermap it found and not the one you want

Summary:
This caused issues when you picked a font with multiple maps, it wouldn't
pick the unicode version but instead pick the last one it saw. Change so
we cache on a per encoding level. There was even a todo list item in the code.

In an ideal world we can probably iterate through at font write time.

Test Plan:
See said unit test, it's Apache Licensed font included
Merge branch 'PHP-5.6'

* PHP-5.6:
  imagettftext() uses the last charactermap it found and not the one you want
  [libxml] Unit test for libxml_disable_entity_loader()
  Add pgsql related change information to NEWS and UPGRADING