live555: fix test programs target installation

Commit 43ebd93e (live555: add error handling to for loop) removed the
shell command delimiter. Add it back.

Fixes:
http://autobuild.buildroot.net/results/00f/00f26fa3b6fc8c707009f44ede7b680849f18d5f/



Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>