gactest/strong name assembly loader tests fail on FullAOT lanes

If you look at our FullAOT test lanes:

The "make -C mono/tests -k test-wrench" ("runtime") step is failing on every lane (Except intel32, but I think that is being masked by other failures). The failure appears to be something with the strong name assembly feature:

MONO_PATH=/mnt/jenkins/workspace/test-mono-mainline-fullaot/label/ubuntu-1404-amd64/mcs/class/lib/testing_aot_full ../../../runtime/mono-wrapper --runtime=mobile -O=gsharedvt --aot=full,nimt-trampolines=2000,ntrampolines=8000,nrgctx-fetch-trampolines=256,ngsharedvt-trampolines=4000 app-v1.exe
Unable to compile method 'void App:Main ()' due to: 'Could not load file or assembly 'gactestlib, Version=, Culture=neutral, PublicKeyToken=537eab56aa911cb7' or one of its dependencies. assembly:gactestlib, Version=, Culture=neutral, PublicKeyToken=537eab56aa911cb7 type:<unknown type> member:<none>'.

app-v1.exe is a test which only runs on fullAOT and hybridAOT test lanes.

Note we have not yet had a FullAOT test run incorporating the results of turning strict strongname loading off by default (but this shouldn't matter since these tests are supposed to have strongname loading hardwired on).