— use upstream rules_swift and tulsi

— update tulsi, apple_support, rules_apple, rules_swift
— bump bazel version to 5.0.0
— bump Xcode version to 13.2.1
— automatically download bazel binaries

build-system/Make/BazelLocation.py

@@ -0,0 +1,32 @@
+import os
+import stat
+import sys
+
+from BuildEnvironment import is_apple_silicon, resolve_executable, call_executable, BuildEnvironmentVersions
+
+def locate_bazel(base_path):
+    versions = BuildEnvironmentVersions(base_path=os.getcwd())
+    if is_apple_silicon():
+        arch = 'darwin-arm64'
+    else:
+        arch = 'x86_64'
+    bazel_name = 'bazel-{version}-{arch}'.format(version=versions.bazel_version, arch=arch)
+    bazel_path = '{}/build-input/{}'.format(base_path, bazel_name)
+
+    if not os.path.isfile(bazel_path):
+        call_executable([
+            'curl',
+            '-L',
+            'https://github.com/bazelbuild/bazel/releases/download/{version}/{name}'.format(
+                version=versions.bazel_version,
+                name=bazel_name
+            ),
+            '--output',
+            bazel_path
+        ])
+
+    if not os.access(bazel_path, os.X_OK):
+        st = os.stat(bazel_path)
+        os.chmod(bazel_path, st.st_mode | stat.S_IEXEC)
+
+    return bazel_path