maint: remove unused include for strings.h

A number of files were including strings.h but not using any
of the functions it provides
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

disas/microblaze.c

@@ -582,7 +582,6 @@ static const char pvr_register_prefix[] = "rpvr";
 #endif /* MICROBLAZE_OPC */
 
 #include "disas/bfd.h"
-#include <strings.h>
 
 #define get_field_rd(instr) get_field(instr, RD_MASK, RD_LOW)
 #define get_field_r1(instr) get_field(instr, RA_MASK, RA_LOW)

hw/pci/shpc.c

 #include "qemu-common.h"
-#include <strings.h>
 #include <stdint.h>
 #include "qemu/range.h"
 #include "qemu/error-report.h"

page_cache.c

@@ -15,7 +15,6 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <strings.h>
 #include <string.h>
 #include <sys/time.h>
 #include <sys/types.h>

tests/test-xbzrle.c

@@ -13,7 +13,6 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <strings.h>
 #include <string.h>
 #include <sys/time.h>
 #include "qemu-common.h"