Fix android build error about already defined struct.

Minimum API version is 9, which already defines this struct in elf.h

Also see qtscript/49ab1bd9838dc3c069be780ff6d69a2543c06ed6 which does
the same thing there.

Change-Id: Ia56f8399156a93edc569e7bb982bd7186a16a445
Reviewed-by: BogDan Vatra <bogdan@kde.org>