4.2 update broke libvpx build

[gorgarp]

building libvpx

Downloading https://github.com/webmproject/libvpx/archive/v1.8.1.tar.gz
... Done
/dev/fd/63: line 197: cd: too many arguments

[gorgarp]

@markus-perl fixed :) Thanks!

[markus-perl]

I'm glad I could help :-)