packaging/static-build: s390x fixes

- Install OpenSSL for key generation in kernel build
- Do not install libpmem
- Do not exclude `*/share/*/*.img` files in QEMU tarball since among
  them are boot loader files critical for IPLing.

Fixes: #2895
Signed-off-by: Jakob Naucke <jakob.naucke@ibm.com>

tools/packaging/static-build/qemu/Dockerfile

@@ -36,7 +36,6 @@ RUN apt-get --no-install-recommends install -y \
 	    libltdl-dev \
 	    libmount-dev \
 	    libpixman-1-dev \
-	    libpmem-dev \
 	    libselinux1-dev \
 	    libtool \
 	    make \
@@ -49,6 +48,8 @@ RUN apt-get --no-install-recommends install -y \
 	    rsync \
 	    zlib1g-dev
 
+RUN [ "$(uname -m)" != "s390x" ] && apt-get install -y libpmem-dev || true
+
 ARG QEMU_REPO
 
 RUN cd  .. && git clone "${QEMU_REPO}" qemu