freetype: fix host headers as well

Like on 0a9cedbc we also need to fix the
headers for the host variant.
Fixes:
http://autobuild.buildroot.net/results/261/261d6a59f144e44e51b38de98a7355a9eb8ac791/



Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>