Allow a different qemu-system-arm to be passed to test scripts

The default qemu-system-arm used within the test automation pipeline
is currently hard coded to use the one within the bitbake image
under test. This commit allows more flexibility with the qemu tool
used.

Future commits will build upon this to allow using a
qemu-system-arm version which supports witherspoon and therefore
will enable regression testing of the witherspoon and other openbmc
platforms within QEMU.

There's a long term goal to ensure the bitbake image builds the
appropriate qemu-system-arm into itself but there are some complexities
with that.

Change-Id: I93d39bf8482acb8adbc2b1da2d805448af2bcf75
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/scripts/build-qemu-robot-docker.sh b/scripts/build-qemu-robot-docker.sh
index 912a4fc..58b6fb0 100755
--- a/scripts/build-qemu-robot-docker.sh
+++ b/scripts/build-qemu-robot-docker.sh
@@ -51,7 +51,9 @@
     diffstat \
     expect \
     curl \
-    build-essential
+    build-essential \
+    libpixman-1-0 \
+    libglib2.0-0
 
 RUN easy_install \
     tox \