Revert "TextView: Fix FBC size breakage"

This reverts commit 8e268f7552ca94716995885483d34d4053cc94a2.
TextView: Fix FBC size breakage, take 2

Double checked BeOS R5 & Haiku R1/A4 and BTextView should be 356
bytes, somewhere since then we've added 4 bytes. So, this commit
reduces the class size from 360 back to 356 by removing 1 reserved
int32 (instead of 2).

I believe the class size changed in hrev46798 as a result of adding
2 bools (1 byte each padded out to 4 bytes).

Sorry for the noise.
Don't provide libtiff in haiku package.

The lib was moved to a separate package, and we should require it
instead.