.travis.yml: allow failure for unreliable hosts

They will still run but they won't get in the way of the result.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20200605154929.26910-6-alex.bennee@linaro.org>

.travis.yml

@@ -429,6 +429,7 @@ jobs:
       env:
         - TEST_CMD="make check check-tcg V=1"
         - CONFIG="--disable-containers --target-list=${MAIN_SOFTMMU_TARGETS}"
+        - UNRELIABLE=true
 
     - name: "[ppc64] GCC check-tcg"
       arch: ppc64le
@@ -493,6 +494,7 @@ jobs:
       env:
         - TEST_CMD="make check check-tcg V=1"
         - CONFIG="--disable-containers --target-list=${MAIN_SOFTMMU_TARGETS},s390x-linux-user"
+        - UNRELIABLE=true
       script:
         - ( cd ${SRC_DIR} ; git submodule update --init roms/SLOF )
         - BUILD_RC=0 && make -j${JOBS} || BUILD_RC=$?
@@ -535,6 +537,7 @@ jobs:
         - TEST_CMD="make check-unit"
         - CONFIG="--disable-containers --disable-tcg --enable-kvm
                   --disable-tools --host-cc=clang --cxx=clang++"
+        - UNRELIABLE=true
 
     # Release builds
     # The make-release script expect a QEMU version, so our tag must start with a 'v'.
@@ -556,3 +559,5 @@ jobs:
         - mkdir -p release-build && cd release-build
         - ../configure ${BASE_CONFIG} ${CONFIG} || { cat config.log && exit 1; }
         - make install
+  allow_failures:
+    - env: UNRELIABLE=true