Revert "Add HB_OFFSETOF"

This reverts commit c86b3fa831f74ab081dc84fa64e009566ec9e00b.

It's C++, we have offsetof(), right?
[arabic] Implement Windows-1256 private shaping

Bug 1045139 - The Arabic text with "MS Sans Serif" font is rendered bad
https://bugzilla.mozilla.org/show_bug.cgi?id=1045139

This is only enabled on Windows platforms, and requires support from
Uniscribe to work.  But for clients that do hook up to Uniscribe, this
fixes shaping of Windows-1256-encoded bitmap fonts like "MS Sans Serif".

The code and table together have just less than a 1kb footprint when
enabled.

UNTESTED.  I might even have broken regular Arabic fallback shaping.