Change the LP64 off_t/loff_t/off64_t definitions to reduce warnings.

Code written for glibc can be sloppy about these types on LP64 and
get away with it. It's probably better for our users if these types
are identical rather than just being the same size.

Change-Id: I3dd116d80569d2d101342a552c55f4a18884025b
1 file changed