On fedora, the freetype cmake module would not find the correct
location. This is because it wasn't using the pkg-cofig include
directory, which is different from the main ft2build.h header directory
(which is /usr/include).
This modification may be a good thing to do on all the cmake packages,
actually. Currently, they all just search for the location of a
specific header, and ignore the pkg-config includes if they find it in
specific hint locations.
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