tools/mkimage: copy mkenvimage to bin directory

For some boards u-boot binary environment file is required,
which is generated by mkenvimage utility. But in OpenWrt there
is no separate support for mkenvimage, which is a part of u-boot tools.
mkenvimage gets built in u-boot/tools as well as mkimage anyways.

So lets just copy mkenvimage to the $(STAGING_DIR_HOST)/bin/ directory.

Signed-off-by: Evgeniy Didin <[email protected]>
CC: Alexey Brodkin <[email protected]>
CC: Hauke Mehrtens <[email protected]>
CC: John Crispin <[email protected]>

tools/mkimage/Makefile

@@ -37,10 +37,12 @@ endef
 
 define Host/Install
 	$(CP) $(HOST_BUILD_DIR)/tools/mkimage $(STAGING_DIR_HOST)/bin/
+	$(CP) $(HOST_BUILD_DIR)/tools/mkenvimage $(STAGING_DIR_HOST)/bin/
 endef
 
 define Host/Clean
 	rm -f $(STAGING_DIR_HOST)/bin/mkimage
+	rm -f $(STAGING_DIR_HOST)/bin/mkenvimage
 endef
 
 $(eval $(call HostBuild))