dump: Fix build breakage (missing sys/procfs.h)

sys/procfs is not available everywhere (MingW does not have it).

Remove this and more unused or redundant include statements.
This fixes the broken build.

qerror.h was previously included indirectly.
Add an explicit include statement for it because it is needed.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

dump-stub.c

@@ -12,22 +12,9 @@
  */
 
 #include "qemu-common.h"
-#include <unistd.h>
-#include "elf.h"
-#include <sys/procfs.h>
-#include <glib.h>
-#include "cpu.h"
-#include "cpu-all.h"
-#include "targphys.h"
-#include "monitor.h"
-#include "kvm.h"
 #include "dump.h"
-#include "sysemu.h"
-#include "bswap.h"
-#include "memory_mapping.h"
-#include "error.h"
+#include "qerror.h"
 #include "qmp-commands.h"
-#include "gdbstub.h"
 
 /* we need this function in hmp.c */
 void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin,