Fix compatibility with older macOS versions

https://forums.ankiweb.net/t/anki-2-1-50-qt5-wont-open/19091

.bazelrc

@@ -10,6 +10,10 @@ build:windows --build_python_zip=false
 # record version/build hash
 build --workspace_status_command='bash ./tools/status.sh'
 
+# support macOS 10.13+
+build:macos --action_env="MACOSX_DEPLOYMENT_TARGET=10.13"
+build:macos --macos_minimum_os=10.13
+
 # run clippy when compiling rust in test mode
 test --aspects=@rules_rust//rust:defs.bzl%rust_clippy_aspect --output_groups=+clippy_checks
 

pylib/rsbridge/BUILD.bazel

@@ -8,6 +8,7 @@ cargo_build_script(
     srcs = ["build.rs"],
     build_script_env = {
         "PYO3_PYTHON": "$(location @python)",
+        "MACOSX_DEPLOYMENT_TARGET": "10.13",
     },
     data = [
         "@python",