[HOST_TOOLS]
Defining -fshort-wchar globally for all host tools breaks every possibility to interact with the host's Unicode support for some operating systems with 4 byte wchar_t (like Mac OS X).
Let's better define no additional global flags and only add -fshort-wchar for the host modules that really need a 2-byte wchar_t for writing ReactOS data files. These are cmlibhost, inflibhost, mkhive and xml2sdb.
Also add -Wno-multichar only for cmlibhost, where it's required.
In preparation for CORE-11988
svn path=/trunk/; revision=72899