[kaffe] Build failure for m68k/nb-1.6 with AC_CHECK_FUNCS_ONCE

[Kiyo Inaba]

Hi,

For the last two months I got build failure on m68k/NetBSD-1.6. After
reporting the failure for m68k/linux, I started to tackle this problem.

Since it has been found from November 9th, I traced back ChangeLog and
noticed AC_CHECK_FUNCS_ONCE or AC_CHECK_HEADERS_ONCE are one possibility.
So, I installed new autoconf, and so on, and regenerate autoconf staffs
without using these two macros (takes time...), and voila..., the build
works for m68k/NetBSD-1.6.

As I proposed in Bug Report #84 in the DB, I think not to use these two
macros for resource limited  environment is better. Of course, usual
resource limited environment also means performance limited environment,
but this is much better if we can compile kaffe even though it takes
more time ;-)

Kiyo