CI: Don't force CMAKE_SYSTEM_NAME for OSX

It was done to address an issue with the Python bindings, which was
solved differently.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>

azure-pipelines.yml

@@ -336,7 +336,7 @@ stages:
  - script: |
  set -e
  mkdir build_tar && cd build_tar
- cmake .. -Werror=dev -DCOMPILE_WARNING_AS_ERROR=ON -DOSX_PACKAGE=OFF -DENABLE_PACKAGING=ON -DCPP_BINDINGS=ON -DPYTHON_BINDINGS=ON -DWITH_SERIAL_BACKEND=OFF -DWITH_ZSTD=OFF -DCPACK_SYSTEM_NAME=${ARTIFACTNAME} -DCMAKE_SYSTEM_NAME="Darwin"
+ cmake .. -Werror=dev -DCOMPILE_WARNING_AS_ERROR=ON -DOSX_PACKAGE=OFF -DENABLE_PACKAGING=ON -DCPP_BINDINGS=ON -DPYTHON_BINDINGS=ON -DWITH_SERIAL_BACKEND=OFF -DWITH_ZSTD=OFF -DCPACK_SYSTEM_NAME=${ARTIFACTNAME}
  make
  make package
  mv ../CI/azure/macos_tar_fixup.sh .