session02: hard-code the value of the macro CLONE_STACK_SIZE
session02: hard-code the value of the macro CLONE_STACK_SIZE

The macro PAGE_SIZE is declared in the following way in Debian:

 #define PAGE_SIZE               (sysconf(_SC_PAGESIZE))

that makes it impossible to use the macro as the size of
the array clone_args::stack since this generates the following error:

cc -g -O2 -Wall -Werror -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0 -iquote ../../lib/arch/arm/include -I../../lib   session02.c ../../lib/libzdtmtst.a   -o session02
session02.c:70:7: error: variably modified 'stack' at file scope

Cc: Andrey Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>
Signed-off-by: Alexander Kartashov <5dbba7f06b96156c7ec38c5bd8a847828ec59a50@parallels.com>
Acked-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@parallels.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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