devel/caf: Turn off TEST by default and fix build under CURRENT without ccache

pkg-fallout has been failing to build caf for amd64 and i386 since
mid March (no viable overloaded '=') but I've been unable to
reproduce this.

Today I tested with 13.0-CURRENT (r360828) and could see the errors
only after disabling ccache. Turning off TEST solves this so let's
remove this option from OPTIONS_DEFAULT.

Both security/bro and security/zeek have used a bundled version of
caf (actor-framework) for some time now so relinquish maintainership
while we're here.

Reported by: pkg-fallout