env: make import/export optional

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/README b/README
index c9fedd8..bc3e905 100644
--- a/README
+++ b/README
@@ -637,6 +637,7 @@
 		CONFIG_CMD_EDITENV	  edit env variable
 		CONFIG_CMD_EEPROM	* EEPROM read/write support
 		CONFIG_CMD_ELF		* bootelf, bootvx
+		CONFIG_CMD_EXPORTENV	* export the environment
 		CONFIG_CMD_SAVEENV	  saveenv
 		CONFIG_CMD_FDC		* Floppy Disk Support
 		CONFIG_CMD_FAT		* FAT partition support
@@ -649,6 +650,7 @@
 		CONFIG_CMD_IMI		  iminfo
 		CONFIG_CMD_IMLS		  List all found images
 		CONFIG_CMD_IMMAP	* IMMR dump support
+		CONFIG_CMD_IMPORTENV	* import an environment
 		CONFIG_CMD_IRQ		* irqinfo
 		CONFIG_CMD_ITEST	  Integer/string test of 2 values
 		CONFIG_CMD_JFFS2	* JFFS2 Support