qemu-build: Update system dependencies

qemu 5.2 requires bzip2 and ninja-build. Install them.

Change-Id: I18d2e7d9e997fc70f993713b14828947c5c50b61
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/qemu-build.sh b/qemu-build.sh
index 37da9c2..9f07cb7 100755
--- a/qemu-build.sh
+++ b/qemu-build.sh
@@ -113,6 +113,7 @@
 ENV DEBIAN_FRONTEND noninteractive
 RUN apt-get update && apt-get install -yy --no-install-recommends \
     bison \
+    bzip2 \
     ca-certificates \
     flex \
     gcc \
@@ -122,6 +123,7 @@
     libglib2.0-dev \
     libpixman-1-dev \
     make \
+    ninja-build \
     python3-yaml \
     iputils-ping