add support for 32-bit filesystem timestamps on 64-bit builds (#3996)
add support for 32-bit filesystem timestamps on 64-bit builds (#3996)

* 32-bit filesystem timestamp support

* c++03 fix

* bde_verify fixes

* review feedback changes

* review feedback changes

* review feedback - doc fix
bloomberg/bde,bloomberg/bde,bloomberg/bde,bloomberg/bde,bloomberg/bde