[Qemu-trivial] [PATCH] docker: fix out-of-tree 'make address@hidden'

[Greg Kurz]

Without this patch, it fails with:

IOError: [Errno 2] No such file or directory:
 'tests/docker/dockerfiles/debian-apt-fake.sh'

Signed-off-by: Greg Kurz <address@hidden>
---
 tests/docker/Makefile.include |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/docker/Makefile.include b/tests/docker/Makefile.include
index 6f9ea196a7b8..5d54eca5d0b3 100644
--- a/tests/docker/Makefile.include
+++ b/tests/docker/Makefile.include
@@ -44,7 +44,7 @@ docker-image-%: $(DOCKER_FILES_DIR)/%.docker
                $(if $(EXECUTABLE),--include-executable=$(EXECUTABLE)),\
                "BUILD","$*")
 
-docker-image-debian-powerpc-cross: 
EXTRA_FILES:=tests/docker/dockerfiles/debian-apt-fake.sh
+docker-image-debian-powerpc-cross: 
EXTRA_FILES:=$(SRC_PATH)/tests/docker/dockerfiles/debian-apt-fake.sh
 
 # Enforce dependancies for composite images
 docker-image-debian: docker-image-debian9