README: Remove mention of libXfont 1.5
xfs was ported to libXfont2 in release 1.2, and bdftopcf 1.1 includes a copy of enough of the old libXfont1 code to not need an external libXfont at all.
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xfs was ported to libXfont2 in release 1.2, and bdftopcf 1.1 includes a copy of enough of the old libXfont1 code to not need an external libXfont at all.