hdf5_msb

[svn-r15273] Purpose: Disable fillval test on Windows

Description:
The fillval test uses random input to test various fill cases.  Certain boundary cases cause the test to fail, which produces sporadic errors on Windows.  There is a bug filed for the issue here:
http://bugzilla.hdfgroup.uiuc.edu/show_bug.cgi?id=1155

We will disable the test until the bug is fixed.

Tested:
None, simply disabled.