criu/arch/arm/bitops.S: fix clang compile

clang-3.8 complains:

> criu/arch/arm/bitops.S:5:2: error: invalid instruction
>  strneb r1, [ip] @ assert word-aligned
>  ^

Apparently (see [1]) this is some old asm syntax, which, I guess,
was deliberately dropped from clang.

[1] https://sourceware.org/ml/libc-ports/2013-03/msg00095.html

Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/arch/arm/bitops.S

 #include "common/asm/linkage.h"
 
+.syntax unified
+
 ENTRY(test_and_set_bit)
 	ands    ip, r1, #3
-	strneb  r1, [ip]                @ assert word-aligned
+	strbne  r1, [ip]                @ assert word-aligned
 	mov     r2, #1
 	and     r3, r0, #31             @ Get bit offset
 	mov     r0, r0, lsr #5