sysconf(3) returns long.

On LP32, this makes no difference. Not an ABI change.

On LP64, results are going to be in %rax or x0 whether they're 32- or 64-bit,
and the only difference is going to be whether the top bits are clobbered.

Bug: 18390956
Change-Id: I0bd4496231bdded34c1fa03e895021ac0df7f8e1
Merge "sysconf(3) returns long."
Increase support of pathconf options.

Bug: 18206366
Change-Id: Ie770e49f5af3631eb9fbd2cd5174edf004c81e00
Merge "Increase support of pathconf options."
Add functions in sysinfo.h.

Bug: 17703902

Change-Id: I699d12d76a8fc483c919be730c2ac63641b71a1d
Merge "Add functions in sysinfo.h."