build: conditional define of struct prctl_mm_map
build: conditional define of struct prctl_mm_map

The file include/prctl.h should define the struct prctl_mm_map only if
it is not already defined in the system include file linux/prctl.h.

The definition should be part of the '#ifndef PR_SET_MM_MAP' block
since this structure is not defined in that case.

Signed-off-by: Laurent Dufour <a59ffce977ae3d39bdc87f81ff88b229ad58db88@linux.vnet.ibm.com>
Reviewed-by: Christopher Covington <a4bb60c1cee4bc57e495283536ad4f6d94bfb161@codeaurora.org>
Reviewed-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

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