readme: Update for libXfont 2.0 interface change

While xfs can be more or less trivially ported to 2.0, bcftopcf cannot
because the font file I/O API is no longer externally visible. This is
intentional, because bdftopcf is literally the only consumer of that
API, and is itself only used in the build process for the classic core
fonts themselves. The plan for bdftopcf is to import a copy of libXfont
1.5 and link against that statically instead.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Acked-by: Peter Hutterer <peter.hutterer@who-t.net>

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