ZDTM build fixes

Errors building natively for x86_64 on Ubuntu 12.04:

session02.c:142:13: error: ‘PR_SET_CHILD_SUBREAPER’ undeclared

session03.c:175:13: error: ‘PR_SET_CHILD_SUBREAPER’ undeclared

vdso01.c:300: undefined reference to `clock_gettime'

Error cross compiling for arm using Linaro 14.01 toolchain:

gcc: warning: ‘-mcpu=’ is deprecated; use ‘-mtune=’ or ‘-march=’ instead
cc1: error: unrecognized command line option ‘-mfpu=neon’
cc1: error: unrecognized command line option ‘-marm’
criu-rtc.c:1:0: error: bad value (cortex-a15) for -mtune= switch
cc1: error: unrecognized command line option ‘-mfpu=neon’
cc1: error: unrecognized command line option ‘-marm’
criu-rtc.pb-c.c:1:0: error: bad value (cortex-a15) for -mtune= switch

Errors cross compiling for aarch64 using Linaro 14.01 toolchain:

maps007.c: In function ‘main’:
maps007.c:88:4: error: passing argument 1 of ‘atomic_read’ from incompatible pointer type [-Werror]
    if (futex_get(&shm->stop) && atomic_get(&shm->delta) == MAX_DELTA)
    ^
In file included from ../../lib/lock.h:10:0,
                 from maps007.c:13:
../../lib/arch/aarch64/include/asm/atomic.h:14:19: note: expected ‘const atomic_t *’ but argument is of type ‘struct f
utex_t *’
 static inline int atomic_read(const atomic_t *v)
                   ^

ptrace.c: In function ‘main’:
ptrace.c:97:15: error: ‘PTRACE_GETREGS’ undeclared (first use in this function)
    if (ptrace(PTRACE_GETREGS, stopped, NULL, regs)) {
               ^

Signed-off-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>