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Instead of adding single archs like x86 to the general CONFIG
variable, we can read the ANDROID_TARGET_ARCH directly in
Qt Creator.

Change-Id: Idc4c4524d0f277aad8e129ca622d64d505a5ac95
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: BogDan Vatra <bogdan@kde.org>