Problem: should not expose ENABLE_XYZ_SELFTEST
Problem: should not expose ENABLE_XYZ_SELFTEST

The selftest program is not optional, so it should not be shown as
such in the configure command line.

Solution: only allow --enable-xyz for non-test mains.

eburkitt/zproject,paddor/zproject,asokoloski/zproject,keent/zproject,taotetek/zproject,taotetek/zproject,twhittock/zproject,eburkitt/zproject,hintjens/zproject,twhittock/zproject,hintjens/zproject,keent/zproject,paddor/zproject,zeromq/zproject,taotetek/zproject,paddor/zproject,asokoloski/zproject,zeromq/zproject,zeromq/zproject