[PATCH v4 3/6] travis.yml: Add pyelftools install entry

[Jagan Teki <jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>]

Currently rockchip platform is using explicit 'make u-boot.itb' for
building u-boot.itb but if we enable CONFIG_BUILD_TARGET as 'u-boot.itb'
then the resulting u-boot.itb directly will create by make.

But, that indeed make travis build fail since it require python-pyelftools
host package.

So add pyelftools install entry as 'pip install pyelftools', this would
create pyelftools on travis host which are required to build rk3399 itb.

Signed-off-by: Jagan Teki <jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
Reviewed-by: Kever Yang <kever.yang-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
---
 .travis.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.travis.yml b/.travis.yml
index 8bd49ef1a5..94b795ef21 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -50,6 +50,7 @@ install:
  - . /tmp/venv/bin/activate
  - pip install pytest==2.8.7
  - pip install python-subunit
+ - pip install pyelftools
  - grub-mkimage -o ~/grub_x86.efi -O i386-efi normal  echo lsefimmap lsefi lsefisystab efinet tftp minicmd
  - grub-mkimage -o ~/grub_x64.efi -O x86_64-efi normal  echo lsefimmap lsefi lsefisystab efinet tftp minicmd
  - mkdir ~/grub2-arm
-- 
2.18.0.321.gffc6fa0e3