Makefile.inc1: Make bootstrap mandoc's bootstrap libz dependency conditionalHEADmain

We bootstrap libz unconditionally on macOS and Linux, and conditionally
on FreeBSD if pre-1600029 or DISK_IMAGE_TOOLS_BOOTSTRAP is enabled, but
if building on new enough -CURRENT without DISK_IMAGE_TOOLS_BOOTSTRAP
then libz is not bootstrapped and so this libz dependency does not
exist. Add the dependency whenever we are bootstrapping libz but not
otherwise, and do so without duplicating the condition.

Fixes:		1dbcc7ee92c4 ("Makefile.inc1: Make sure mandoc bootstrap tool depends on libz")
MFC after:	1 week

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