diffutils: use malloc() and realloc() from libc as-is

diffutils' version of autoconf tries to run a test
program to determine if malloc() and realloc() behave
like in glibc, i.e. returning non-NULL when given 0 as
size. Running a test program doesn't work when cross-
compiling, so it defaults to assuming different
behaviour and compiles wrappers around malloc() &
realloc().

Given they behave the same in musl (these days), and
given uClibc isn't supported anymore, we can specify
the test-result, and avoid having to use diffutil's
replacement functions.

jm_cv_func_working_malloc and jm_cv_func_working_realloc
are similar to ac_cv_func_malloc_0_nonnull and
ac_cv_func_realloc_0_nonnull, which oe-core sets in
the site configuration in meta/site/, except that the
former two are the flags for the older version of
autoconf used by this package.

Signed-off-by: André Draszik <git@andred.net>
Signed-off-by: Ross Burton <ross.burton@intel.com>

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