vchoi_fork

[svn-r15660] Purpose: Fix minor Windows issues in new H5EA interface.

Description:
We've run into a few Windows-specific problems with the new H5EA interface.  In particular, this checkin makes the following changes:
-- Change shutdown defined in earray.c to shutdown_ea, to avoid conflicting with another Windows-specific system call.
-- Prefix H5EA_get in H5EAprivate.h with H5_DLL, so the function is properly exported in Windows DLL version.

These changes shouldn't break any other platforms.

Tested:
VS2005 on WinXP
h5committest (linew kagiso smirom)