FreeBSD: Don't set MANPATH, use OS configuration

- make installer to set up man(1) paths using /usr/local/etc/man.d/*
- don't override empty/unset MANPATH with compiled in default

cde/programs/dtlogin/config/0060.dtsysenv.src

@@ -27,6 +27,7 @@ XCOMM ####################################################################
 
 #define HASH #
 
+#if !defined(__FreeBSD__)
 HASH
 HASH Source TIMEZONE
 HASH
@@ -55,6 +56,7 @@ if [ -f $MANPATH_FILE -a -r $MANPATH_FILE ]; then
         export MANPATH="$MANPATH:`cat $MANPATH_FILE`"
 fi
 unset MANPATH_FILE
+#endif
 
 XCOMM #########################         eof       #####################