[v2]: Correct musl malloc fix.
remove HAVE_MALLOC_H define; this enables using the included defined mallinfo.
[V1]: Fix c99
x_dnmalloc.c:563:26: error: return type is an incomplete type
| #define public_mALLINFo mallinfo
| ^
| x_dnmalloc.c:1689:17: note: in expansion of macro 'public_mALLINFo'
| struct mallinfo public_mALLINFo() {
and
_dnmalloc.c:5527:17: error: unknown type name 'u_int'
| u_int rnd[(128 - 2*sizeof(struct timeval)) / sizeof(u_int)];
| ^~~~~
Signed-off-by: Armin Kuster <akuster808@gmail.com>