fix building on newest glibc and kernel

On Fedora rawhide with kernel-headers-4.14.0-0.rc2.git0.1.fc28.x86_64
glibc-devel-2.26.90-15.fc28.x86_64 criu does not build any more:

In file included from /usr/include/linux/aio_abi.h:31:0,
                 from criu/cr-check.c:24:
/usr/include/sys/mount.h:35:3: error: expected identifier before numeric constant
   MS_RDONLY = 1,  /* Mount read-only.  */
   ^
make[2]: *** [/builddir/build/BUILD/criu-3.5/scripts/nmk/scripts/build.mk:111: criu/cr-check.o] Error 1
make[1]: *** [criu/Makefile:73: criu/built-in.o] Error 2
make: *** [Makefile:233: criu] Error 2

This simple re-ordering of includes fixes it for me.
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/cr-check.c

@@ -21,8 +21,8 @@
 #include <netinet/in.h>
 #include <sys/prctl.h>
 #include <sched.h>
-#include <linux/aio_abi.h>
 #include <sys/mount.h>
+#include <linux/aio_abi.h>
 
 #include "../soccr/soccr.h"