Make test runners support execution runtimes (#2360)

If the result of a build is not directly executable on the host
system or needs an execution runtime for any other reason (e.g.,
cross-compiled ARM binaries on Intel, emscripten-generated JS
files, binaries built with Valgrind support) then the current test
runners cannot work with them. This patch makes test runners
execute binaries via a runtime given in the `$RUNTIME` environment
variable (if it is specified).

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

tools/runners/run-unittests.sh

@@ -65,8 +65,8 @@ UNITTEST_TEMP=`mktemp unittest-out.XXXXXXXXXX`
 
 for unit_test in $UNITTESTS
 do
-    cmd_line="${unit_test#$ROOT_DIR}"
-    $unit_test &>$UNITTEST_TEMP
+    cmd_line="$RUNTIME ${unit_test#$ROOT_DIR}"
+    $RUNTIME $unit_test &>$UNITTEST_TEMP
     status_code=$?
 
     if [ $status_code -ne 0 ]