makeman: Don't require filemon with MK_DIRDEPS_BUILD.

[bdrewery]

Summary

makeman uses make showconfig at the top-level while iterating over
every option combination. When it runs make showconfig MK_DIRDEPS_BUILD=yes
it encounters the requirement for filemon to be loaded. We don't need
filemon here as it is only displaying all MK_ values.

[dim]

I've been using this for a while already, since otherwise makeman fails for me. :)

[sjg]

share/mk/meta.sys.mk

142

This would be better done via local.meta.sys.mk eg

.if make(showconfig)
UPDATE_DEPENDFILE= no
.endif

then meta.sys.mk could be kept in sync with bmake distrib

[bdrewery]

Move to local.meta.sys.mk

[bdrewery]

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