[patch] test-in-container: fix Arch Linux build-programs bug?

[Joseph Myers]

On Wed, 5 Sep 2018, Albert ARIBAUD wrote:

> The workaround is to manually pre-set CXX=arm-linux-gnueabi-g++ and
> export it (hence overriding any configure guesswork about the C++
> compiler). If I do this, then the build failure disappears.

Exporting the variables in the environment is another obsolescent practice 
(setting them on the configure command line, as arguments to configure, is 
preferred for configure scripts generated with autoconf 2.50 or later).  
(See NEWS for autoconf 2.50, released in 2001.)

-- 
Joseph S. Myers
joseph@codesourcery.com