* fpcmake.ini: object file extension for mos6502-embedded is .rel

utils/fpcm/fpcmake.ini

@@ -1318,6 +1318,9 @@ endif
 ifeq ($(CPU_TARGET),z80)
 OEXT=.rel
 endif
+ifeq ($(CPU_TARGET),mos6502)
+OEXT=.rel
+endif
 SHORTSUFFIX=emb
 endif
 ALL_EXEEXT+=.bin