Fix macOS CI

Author: illwieckz

azure-pipelines.yml

@@ -52,7 +52,10 @@ jobs:
       displayName: 'Check out submodules'
     - bash: |
         set -e
+        set -x
         cmake --version
+        export CFLAGS='-Wno-c++14-extensions'
+        export CXXFLAGS='-Wno-c++14-extensions'
         cmake -Wdev -Wdeprecated -DUSE_PRECOMPILED_HEADER=0 -DUSE_WERROR=1 -DBE_VERBOSE=1 -DCMAKE_BUILD_TYPE=Release -DBUILD_DUMMY_APP=1 -DBUILD_TESTS=1 -H. -Bbuild
         cmake --build build -- -j`sysctl -n hw.logicalcpu`
       displayName: 'Build'