Upgrade version of clang used to build macOS .pkg (v8 to v9).

Followed 21f77fd8 which did the same for py packages.

misc/continuous_integration/jobs/macosx/pkg_macos.sh

@@ -10,7 +10,7 @@ then
 	mkdir build
 fi
 cd build
-cmake -DOpenMP_gomp_LIBRARY=/opt/local/lib/libomp/libgomp.dylib -DBUILD_WRAPPER_PYTHON=ON -DBUILD_DOCUMENTATION=ON -DCMAKE_INSTALL_PREFIX=/opt/local/faust -DCPACK_PACKAGE_VERSION=$FAUST_VERSION -DCMAKE_BUILD_TYPE=Release -DEXCLUDE_FAUST_LIB_INSTALL=ON -DBUILD_TESTING=OFF -DREMOTE_DATA_URL="$DURL" -DREMOTE_DATA_FILE="$DFILE" -DBUILD_MULTITHREAD=ON -DNOPY2=ON -DCMAKE_CXX_COMPILER=/opt/local/bin/clang++-mp-8.0 -DBUILD_FLOAT_PYX=ON -DBUILD_FLOAT_MEX=ON -DEXPERIMENTAL_PKG=$EXPERIMENTAL_PKG ..
+cmake -DOpenMP_gomp_LIBRARY=/opt/local/lib/libomp/libgomp.dylib -DBUILD_WRAPPER_PYTHON=ON -DBUILD_DOCUMENTATION=ON -DCMAKE_INSTALL_PREFIX=/opt/local/faust -DCPACK_PACKAGE_VERSION=$FAUST_VERSION -DCMAKE_BUILD_TYPE=Release -DEXCLUDE_FAUST_LIB_INSTALL=ON -DBUILD_TESTING=OFF -DREMOTE_DATA_URL="$DURL" -DREMOTE_DATA_FILE="$DFILE" -DBUILD_MULTITHREAD=ON -DNOPY2=ON -DCMAKE_CXX_COMPILER=/opt/local/bin/clang++-mp-9.0 -DBUILD_FLOAT_PYX=ON -DBUILD_FLOAT_MEX=ON -DEXPERIMENTAL_PKG=$EXPERIMENTAL_PKG ..
 make -j4 LANG=en_GB.UTF-8
 # to compile matlab wrappers use matlab libiomp5 but backup the clang lib first
 #- sudo mv /opt/local/lib/libomp/libomp.dylib /opt/local/lib/libomp/libomp.dylib.bak