tools: include sys/sysmacros.h on Linux

Due to a bug in the glibc headers the macros makedev(), major() and
minor() where avaialble by including sys/types.h. This bug was
addressed in glibc-2.25 by introducing a warning when these macros are
used. Since Xen is build with -Werror this new warning cause a compile
error.

Use sys/sysmacros.h to define these three macros.

blktap2 is already Linux specific. The kernel header which was used to
get makedev() does not provided it anymore, and it was wrong to use a
kernel header anyway.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Wei Liu <wei.liu2@citrix.com>

tools/blktap2/control/tap-ctl-allocate.c

@@ -33,6 +33,7 @@
 #include <string.h>
 #include <getopt.h>
 #include <libgen.h>
+#include <sys/sysmacros.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/ioctl.h>

tools/libxl/libxl_osdeps.h

@@ -39,6 +39,7 @@
 #define SYSFS_PCI_DEV          "/sys/bus/pci/devices"
 #define SYSFS_PCIBACK_DRIVER   "/sys/bus/pci/drivers/pciback"
 #define NETBACK_NIC_NAME       "vif%u.%d"
+#include <sys/sysmacros.h>
 #include <pty.h>
 #include <uuid/uuid.h>
 #elif defined(__sun__)