Use --features instead of -H:Features.

(cherry picked from commit 91f5282)

Author: fniephaus

graalpython/com.oracle.graal.python/src/META-INF/native-image/org.graalvm.py/native-image.properties

@@ -2,6 +2,6 @@
 Args = -H:MaxRuntimeCompileMethods=20000 \
        --initialize-at-build-time=com.oracle.graal.python,com.oracle.truffle.regex,jline,org.fusesource \
        --initialize-at-run-time=org.tukaani.xz \
-       -H:Features=com.oracle.graal.python.BouncyCastleFeature \
+       --features=com.oracle.graal.python.BouncyCastleFeature \
        --add-exports=org.graalvm.nativeimage/org.graalvm.nativeimage.impl=org.graalvm.py \ 
        --add-exports=org.graalvm.nativeimage/org.graalvm.nativeimage.impl=ALL-UNNAMED