xerial#168: Rename dockcross script name

Author: xerial

Makefile

@@ -191,7 +191,7 @@ linux-android-arm: jni-header
 	./docker/dockcross-android-arm -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=/usr/arm-linux-androideabi/bin/arm-linux-androideabi- OS_NAME=Linux OS_ARCH=android-arm'
 
 linux-ppc64le: jni-header
-	./docker/dockcross-ppc64 -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=powerpc64le-linux-gnu- OS_NAME=Linux OS_ARCH=ppc64le'
+	./docker/dockcross-ppc64le -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=powerpc64le-linux-gnu- OS_NAME=Linux OS_ARCH=ppc64le'
 
 linux-aarch64: jni-header
 	./docker/dockcross-aarch64 -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=aarch64-linux-gnu- OS_NAME=Linux OS_ARCH=aarch64'