There is no need to create a separate buildDir for each test
file, use TestMain to create a global one for the package.
Test: all soong tests
Change-Id: I435ee7aa88b7e0bb8ccc1ba79f82833a7accf3e9
Test: internal (see android/vts_config_test.go) + run 'm vts' and check
that host/linux-x86/vts/android-vts.zip remians the same
Change-Id: I0249a974a240e7669c3b9378c17739df8e120873
Fixes: 122617100