Fixed PIL build flags and Tremor import path

Fix for (once again) failing kivy-ios builds.

Specifically, the PIL compiler has incorrect compile flags with the current version of freetype, and the Tremor clone fails, wtih:

svn: E175002: Unable to connect to a repository at URL 'http://svn.xiph.org/trunk/Tremor'
svn: E175002: OPTIONS of 'http://svn.xiph.org/trunk/Tremor': Could not read status line: connection was closed by server (http://svn.xiph.org)

My solution here may not be optimal, all I've done is include the correct folder for freetype (not figure out why the previous include folder suddenly doesn't work, because it *did* work about a week ago), and change the svn checkout to https instead of http.

So feel free to reject this pull request; but at the very least for the time being having this pull request open means anyone else who finds that this doesn't build will be able to at least get a working version.