Remote test execution for cross compiled tests. Run it like:

$ ./gradlew backend.native:tests:run \
    -Premote=user@111.22.33.444 -Ptest_target=raspberrypi

The new gradle command line options:

    -Pbuild_flags  renamed -Pkonanc_flags.
    -Ptest_flags   provides compiler flags to the test builds.
    -Ptest_target  properly sets up compiler as well as interop
                   to cross compile tests.
    -Premote       specifies remote host and login.

backend.native/tests/interop/basics/3.kt

@@ -26,4 +26,4 @@ private fun comparator(a: COpaquePointer?, b: COpaquePointer?): Int {
     val bValue = b!!.reinterpret<CInt32Var>().pointed.value
 
     return (aValue - bValue)
-}
+}