[HarfBuzz] Buildfix for non pkg-config ICU installations

[Dominik Röttsches]

Hi,

I filed https://bugs.freedesktop.org/show_bug.cgi?id=57608 for this and 
attached the patch.

Regards,

Dominik

-- 
Dominik Röttsches <dominik.rottsches at intel.com>

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