hdf5_ep

[svn-r15803] Description:
	Bring r15802 back from trunk:

        Skip some file free space tests that deal with aligned allocations when
using the stdio VFD, which has its own allocation process that drops the
unaligned fragments instead of tracking them with the free space manager.

Tested on:
	Mac OS X/32 10.5.5 (amazon) w/stdio driver