zld: port over a few more bits from ld64

* UTF16 gets its own section, `__TEXT,__ustring`
* TLV data and bss sections have to aligned to the same max alignment
  according to Apple rdar comment in the latest ld64
96556ce8b8Jakub Konka committed on 5/4/2021, 11:09:32 AMparent1867c3c
1 file changedLine totals unavailable