Replace use of $(LINK) with $(CLINK) or $(CXXLINK) as warranted.
When the Qt interface is enabled, the utility programs were all
(except dlb) being linked with C++ support. That didn't cause
any problems, just looked wrong. Link them as C instead of C++.
Two actually do need C++ support (and still have it) but both
are dead: 'tile2beos' because the source file doesn't exist (not
even in 'outdated'), 'tileedit' because it won't build with Qt5.
I didn't bother with QUIETCC support for them.
There were still a couple of references to dgn_comp (for the lint
target; just in the name of a macro, not its value); remove those.
d20394c4bc