Fix ExportImport test cmp0022NEW build on Watcom

The test uses generate_export_header(cmp0022OLD ...) to generate the
cmp0022_export.h header used by both cmp0022OLD and cmp0022NEW.  In
the latter the _EXPORTS symbol does not match what the header expects
so the library does not export anything.  The Watcom linker does not
like to create shared libraries that do not export any symbols.

Fix this by setting the DEFINE_SYMBOL property on cmp0022NEW to match
that of cmp0022OLD as the header expects.
Merge topic 'INTERFACE_LINK_LIBRARIES-prop' into next

295a42c Fix ExportImport test cmp0022NEW build on Watcom