rt-tests: requires thread support in the toolchain

The rt-tests package extensively use threads, so this package should
only be available if the toolchain has thread support.

[Peter: add comment when not available]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
1 file changed