Have 'make clean' and 'make spotless' in 3.7 cleanup include/tile.h
from 3.6. Otherwise use of 'cc -I../include -I../win/share' in
util/Makefile will get 3.6's include/tile.h instead of 3.7's
win/share/tile.h; use of FDECL() causes the old header to break when
used in various tiles utilities.
df18c96840