Adding binutils-dev for efi compile

.travis.yml

@@ -2,7 +2,7 @@ sudo: true
 language: c
 before_install:
 - sudo apt-get update -qq
-- sudo apt-get install -qq genisoimage liblzma-dev syslinux
+- sudo apt-get install -qq binutils-dev genisoimage liblzma-dev syslinux
 script:
 - "./script/prep-release.sh"
 before_deploy: