bf_test fails to build on Mac OS X (latest CVS)

[Jun T. <tak...@kb...>]

Compiling bf_test.c fails on my Mac as follows:

bf_test.c:24:10: fatal error: 'malloc.h' file not found

malloc.h is not available on Mac OS X; calloc() is in stdlib.h.

Since configure script checks for both stdlib.h and malloc.h,
it would be possible to use HAVE_STDLIB_H and HAVE_MALLOC_H
to include proper header file. I believe we can ignore systems
on which neither stdlib.h nor malloc.h is available.