build fix: use 'xft-config' instead of 'pkg-config' to use the right libs

when linking with binutils-gold and --no-add-needed it is not enough to
just use -lXft but it must be -lXft -fontconfig (and some more). since we
use 'pkg-config --libs' to find out about the needed flags and 'pkg-config'
only returns -lXft (except by using

   pkg-config --libs `pkg-config --print-requires-private xft`

) we switched to 'xft-config --libs' which gives us the complete list of
all needed libs.

the issue was brought to attention by

   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=554386

but the proposed fix was just quick and dirty.

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