make 3.82 understands mixed paths, so use them.
This allows us to get rid of evil in BuildDirs.mk.
Hopefully, life will be simpler now.
Change-Id: I I I641f28c6af1948963f7004f8071af62e21caabb3
Use \ instead of / in path, but more importantly,
use relative path, because '-' in path caused build error.
Path was truncated right before the '-'. We could have put it
between quotes, but then the SO_ACTIVEX_TLB_DIR define would not
be substituted, so instead of hacking of the rc, I chose this
solution.
e
