Remove driver_cross test as not needed.

It doesn't have a correct crossdist dependency

backend.native/tests/build.gradle

@@ -2429,19 +2429,6 @@ task driver_opt(type: RunDriverKonanTest) {
     flags = ["-opt"]
 }
 
-// Check that cross-compilation completes successfully. We can't run such 
-// binaries, but we verify that the compiler has been built, operational 
-// and accepts the -target flag, resulting in a successful compilation.
-task driver_cross(type: RunDriverKonanTest) {
-    source = "runtime/basic/driver0.kt"
-    run = false
-    if (isLinux()) {
-        flags = ["-target", "raspberrypi"]
-    } else if (isMac()) {
-        flags = ["-target", "iphone"]
-    }
-}
-
 // Enable when deserialization for default arguments is fixed.
 task inline_defaultArgs_linkTest(type: LinkKonanTest) {
     goldValue = "122\n47\n"