[kaffe] HAVE_ref_eq_int

[Kiyo Inaba]

While trying to port Transvertual's version of sh-jit to the current, I noticed
one macro 'HAVE_ref_eq_int' unused. This macro is only found in following three
files.
	config/m68k/jit-icode.h
	config/m68k/jit3-icode.h
	kaffe/kaffevm/jit3/funcs.h

But in the former two files this is undef'ed, and in the later it only defines
one external variable. According to the comment, the intention of this macro is
clear, but the intention has never be implemented, as far as I know.

Is it ok to remove this macro?

Kiyo