Fix the MANZ handling in bsd.pkg.mk. If MANZ is defined, then we want

the final man pages to be compressed.  If MANZ is not defined, then
we want the final man pages to be uncompressed.

We need to figure out if during installation, we need either gunzip
or gzip to decompress or compress the installed man pages.  If a
package sets MANCOMPRESSED to "yes" or "no", then it's an indication
to the install code that the package itself installed the man pages
either compressed or uncompressed.  If a package sets
MANCOMPRESSED_IF_MANZ, then the package uses BSD-style makefiles, so
we need to determine if the BSD-style makefile causes the man pages
to be compressed or not.  In this case, we need to check in PKGMAKECONF
whether MANZ is set or not.

XXX Perhaps we should also check for MKMANZ if a package uses BSD-style
XXX makefiles?

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