Merge #83: ci: Fix "s390x (big-endian)" task

0498084 ci: Fix "s390x (big-endian)" task (Hennadii Stepanov)

Pull request description:

ACKs for top commit:
  sipa:
    utACK 0498084
  fanquake:
    ACK 0498084

Tree-SHA512: e5b9b6f1eeb1ef0b67c7620fbd8331d2bc05ca8f03bbec67dc57236525f4cb728d31e6273763b3dfb2d6fad7e901fbd450d28a38e074d6a4de9d5bb76d0c7036

Author: sipa

.cirrus.yml

@@ -132,13 +132,11 @@ task:
     cpu: 4
     memory: 2G
   env:
-    EXEC_CMD: qemu-s390x -L /usr/s390x-linux-gnu
+    EXEC_CMD: qemu-s390x
     HOST: s390x-linux-gnu
     BUILD:
   << : *MERGE_BASE
   test_script:
-    # https://sourceware.org/bugzilla/show_bug.cgi?id=27008
-    - rm /etc/ld.so.cache
     - ./ci/cirrus.sh
   << : *CAT_LOGS
 

ci/linux-debian.Dockerfile

@@ -10,7 +10,7 @@ RUN apt-get install --no-install-recommends --no-upgrade -y \
         make automake libtool pkg-config dpkg-dev valgrind qemu-user \
         gcc g++ clang libclang-rt-dev libc6-dbg \
         gcc-i686-linux-gnu g++-i686-linux-gnu libc6-dev-i386-cross libc6-dbg:i386 \
-        g++-s390x-linux-gnu gcc-s390x-linux-gnu libc6-dev-s390x-cross libc6-dbg:s390x \
+        g++-s390x-linux-gnu libstdc++6:s390x gcc-s390x-linux-gnu libc6-dev-s390x-cross libc6-dbg:s390x \
         wine wine64 g++-mingw-w64-x86-64
 
 # Run a dummy command in wine to make it set up configuration