remove JAVA_HOME sanity check

Author: stoty

platform/o.n.bootstrap/launcher/unix/nbexec

@@ -158,7 +158,7 @@ if [ -z "$jdkhome" ] ; then
             fi
             ;;
             *)
-            if [ ! -z "x${JAVA_HOME}" -a -x "${JAVA_HOME}/bin/java" ]; then
+            if [ ! -z "x${JAVA_HOME}" ]; then
                 jdkhome="${JAVA_HOME}"
             else
                 # Doesn't work with jenv-style shims