Clear the link information in ClearLinkMaps.

The cache here needs to be cleared if GetLinkInformation is called
at configure-time, such as during an export().

The next commit does exactly that, and without this patch,
the LinkLanguage test would fail.
Export the COMPATIBLE_INTERFACE_BOOL content properties
Merge topic 'fix-COMPATIBLE_INTERFACE-properties' into next

f774699 Export the COMPATIBLE_INTERFACE_BOOL content properties
68d3d02 Clear the link information in ClearLinkMaps.