criu: arm -- Guard __ARM_NR_ definitions

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/arch/arm/include/asm/syscall-aux.h

 #define __NR_mmap2 192
 
-#define __ARM_NR_BASE                   0x0f0000
-#define __ARM_NR_breakpoint             (__ARM_NR_BASE+1)
-#define __ARM_NR_cacheflush             (__ARM_NR_BASE+2)
-#define __ARM_NR_usr26                  (__ARM_NR_BASE+3)
-#define __ARM_NR_usr32                  (__ARM_NR_BASE+4)
-#define __ARM_NR_set_tls                (__ARM_NR_BASE+5)
+#ifndef __ARM_NR_BASE
+# define __ARM_NR_BASE                   0x0f0000
+#endif
+
+#ifndef __ARM_NR_breakpoint
+# define __ARM_NR_breakpoint             (__ARM_NR_BASE+1)
+#endif
+
+#ifndef __ARM_NR_cacheflush
+# define __ARM_NR_cacheflush             (__ARM_NR_BASE+2)
+#endif
+
+#ifndef __ARM_NR_usr26
+# define __ARM_NR_usr26                  (__ARM_NR_BASE+3)
+#endif
+
+#ifndef __ARM_NR_usr32
+# define __ARM_NR_usr32                  (__ARM_NR_BASE+4)
+#endif
+
+#ifndef __ARM_NR_set_tls
+# define __ARM_NR_set_tls                (__ARM_NR_BASE+5)
+#endif