Enrico added the fontforge files for all fonts (see http://www.lyx.org/trac/ticket/6115 for the reason). Now we have the one which did exist previously in the tar ball, and the others not (see dist_noinst_DATA in lib/Makefile.am).
We should handle all .sfd files alike, so either add the others or remove the existing one. I suggest to remove the existing one, since the .sfd files are not used in our build and only needed in very rare cases, and they are not small files. Georg