Fix build a chec failures after b05fae4d8e

The include cleanup on dl-minimal.c removed too much for some
targets.

Also for Hurd, __sbrk is removed from localplt.data now that
tunables allocated memory through mmap.

Checked with a build for all affected architectures.

elf/dl-minimal.c

@@ -23,6 +23,8 @@
 #include <dl-sym-post.h>
 #include <_itoa.h>
 #include <dl-minimal-malloc.h>
+#include <stdio.h>
+#include <unistd.h>
 
 
 /* The rtld startup code calls __rtld_malloc_init_stubs after the

sysdeps/mach/hurd/i386/localplt.data

@@ -35,7 +35,6 @@ ld.so: __access
 ld.so: __access_noerrno
 ld.so: __getpid
 ld.so: __getcwd
-ld.so: __sbrk
 ld.so: _exit ?
 ld.so: abort
 ld.so: _hurd_intr_rpc_mach_msg