Add host.test.mk for DIRDEPS_BUILD

[sjg]

Summary

If we are doing DIRDEPS_BUILD and MK_RUN_TEST is yes
we can hook tests associated with dirs to be built into the graph
such that we avoid circular dependencies but the build will fail
should any test fail.

Sponsored by: Juniper Networks, Inc.

[sjg]

Fix typo in log message

[sjg]

Add host.test.mk to FILES

[sjg]

Give this a chance of being useful to non-DIRDEPS_BUILD

[stevek]

share/mk/host.test.mk

3

This comment should be updated, since you've made changes to try to make it useful for non-DIRDEPS build also.

[sjg]

Update comment at start of host.test.mk

[stevek]

Looks good now