Add entries in optable.xml for obsolete 8087 instructions FNENI (DB E0), FNDISI (DB E1), FNSETPM (DB E4), and FRSTPM (DB E5).  All but the latter execute (as NOPs) on modern CPUs.
Add entries in optable.xml for obsolete 8087 instructions FNENI (DB E0), FNDISI (DB E1), FNSETPM (DB E4), and FRSTPM (DB E5).  All but the latter execute (as NOPs) on modern CPUs.

radare/udis86,radare/udis86,radare/udis86