odk/examples/DevelopersGuide/Components/SimpleLicense/ builds an example
extension with a license that needs to be accepted when the extension is
installed.  That's why odk/CustomTarget_build-examples.mk writes "yes" into
stdin.  Unfortunately, the expected acceptance string is localized, so running
this in e.g. a Linux de_DE.UTF-8 locale fails.  For Linux and macOS at least
(which are the only platforms on which this test is currently enabled), it
suffices to to set LC_ALL=C to force LO into its en-US locale.

Change-Id: I1df0ea89400913ac3f1c90507721040119354727
Reviewed-on: https://gerrit.libreoffice.org/34951Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
Tested-by: Jan-Marek Glogowski <glogow@fbihome.de>