COMMON: Make Coverity 6.6.1 happier

Apparently their tools do not include __has_feature clang extension.
I've submitted the bugreport to them but in the meantime let's have this
define in the system.
SWORD25: Remove explictit #includes

Makes Coverity happier.
DEVTOOLS: Make Coverity happy.

This is mainly due to unhandled clang __has_featrure() buit-in.
I do not like this hack, but Coverity proved to be a very good tool for us.