Remove ARCH_ARM.

Change-Id: Ic3014aa01f82204b75c54ab3f7afa3a44890e02e
Remove ARCH_X86.

Change-Id: I832247bec22f23666f14dfb715192ada201ab097
Merge "Remove ARCH_ARM."
Merge "Remove ARCH_X86."
bionic doesn't implement _FILE_OFFSET_BITS.

Change-Id: Iec9978e0bb69585dde69593402d53309e0ecb662
Darwin has never had a 32-bit off_t.

Change-Id: Ifa48fab99d73fb532afc56d235b7397e05c0fc6a
Merge "Darwin has never had a 32-bit off_t."
Merge "bionic doesn't implement _FILE_OFFSET_BITS."