configure.in: Add check for malloc.h needed by m68k for function free().

configure.in: Add check for malloc.h needed by m68k for function free().

* configure.in: Add check for malloc.h needed by
m68k for function free().
* configure: Regenerated.
* config.in: Add HAVE_MALLOC_H.
* hashtab.c: include malloc.h were available for
free().

From-SVN: r68213