CMakelists.txt fix for Freetype builds

[roxlu]

Instead of searching for freetype using pkg-config, use the FindFreetype feature of CMake. This allows for better integration with other projects that make use of CMake.

I've created a patch here https://gist.github.com/roxlu/0108d45308a0434e27d4320396399153#file-harfbuzz_freetype_fix-patch

You can clone that gist and compile it using the cmake_build.sh script. Tested on Windows (in Git Bash) and on OSX.

• I haven't marked the include directories as advanced in the CMakelists.txt.

[ebraminio]

Great. It is OK I believe since you've tested Windows also specifically. Please upload it as a pull request and it will be merged. Marking folders as advanced follows WebKit convention, no problem if is not possible on your change.

[behdad]

What's the status of this?

[ebraminio]

@roxlu: can you please propose the change as PR?

[khaledhosny]

I toke the liberty to submit a PR for this patch #564.