Problem: Cannot disable cscope interface using configure, because in
feature.h FEAT_CSCOPE will always be enabled for huge builds
(chdiza)
Solution: Don't define FEAT_CSCOPE from configure script but set the
ENABLE_CSCOPE flag and check for the presence of that flag in
feature.h
fixes: #17825
closes: #17842
Signed-off-by: Christian Brabandt <cb@256bit.org>