FENNEL:  more MacOS Boost 1.40 build tweaks
FENNEL:  more MacOS Boost 1.40 build tweaks

[git-p4: depot-paths = "//open/dev/": change = 13435]

LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb