The 'essential' object metadata was removed long ago, fully remove it.

--HG--
extra : convert_revision : d110ecf59b07e84c6930d1212702b67cc4a4112b

xbps-src/shutils/metadata.sh

@@ -54,7 +54,7 @@ xbps_write_metadata_pkg()
 		fi
 		setup_tmpl ${sourcepkg}
 		unset run_depends conf_files noarch triggers replaces \
-			revision openrc_services system_accounts essential \
+			revision openrc_services system_accounts \
 			preserve keep_empty_dirs xml_entries sgml_entries \
 			xml_catalogs sgml_catalogs gconf_entries gconf_schemas \
 			gtk_iconcache_dirs font_dirs
@@ -296,12 +296,6 @@ _EOF
 		Add_dependency run shadow
 	fi
 
-	# Is this an essential pkg?
-	if [ -n "$essential" ]; then
-		echo "<key>essential</key>" >> $TMPFPROPS
-		echo "<true/>" >> $TMPFPROPS
-	fi
-
 	# pkg needs to preserve its files after removal/upgrade?
 	if [ -n "$preserve" ]; then
 		echo "<key>preserve</key>" >> $TMPFPROPS