Fix compile for harfbuzz-ng for wince

CRITICAL_SECTION has different members, so adjust that

strdup is only there as _strdup so use that

There is no MemoryBarrier()

There is no environment so dont use getenv

There is no locale so dont use it

There is no errno so just fake it

Change-Id: Ia7197c4f0df50513078c906ed503aec33ee42b82
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>