Disable memfd_create tests on ART host tests.

memfd_create only supports bionic-based platforms (see code below). I
plan to investigate whether it _should_ support host, and whether
it needs to be added to libcore's virtualdeviceknownfailures.txt,
separately but for now this CL fixes the urgent issue of the test
breaking the ART host tests.

Test: Treehugger
Change-Id: Ibbbcaffd7abd1784f9e5ee51393f1e83ba6b6291
1 file changed