It's a workaround to clang-3.4, which doesn't handle numbers
in asm macros rightly:
https://llvm.org/bugs/show_bug.cgi?id=21500

Which resulted in:
  CC       compel/arch/x86/plugins/std/parasite-head.o
<instantiation>:3:2: error: too few operands for instruction
 pushq
 ^
compel/arch/x86/plugins/std/parasite-head.S:26:2: note: while in macro instantiation
 PARASITE_ENTRY
 ^

Fixes: https://travis-ci.org/0x7f454c46/criu/jobs/186099057

travis-ci: success for 32-bit tests fixes
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>