Moved nsInterfaceInfoManager files from the libxpt directory (where
they would have precipitated an unpleasant circular dependency between
xpidl and nsISupports.h) into a new subdirectory.
Added corresponding entries to allmakefiles.sh.
nsInterfaceInfoManager is intended to abstract the loading and
management of typelib information generated by xpidl, for use by
xpconnect.
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