Swift genrule: Replace local with no-sandbox.

This allows the bazel cache to cache this genrule invocation.
It shouldn't depend on system-specific binaries, so
I believe this is correct.
This is the only part of our build where we otherwise
need to recompute parts after pulling in a full cache.

Author: criemen

swift/third_party/BUILD.swift-toolchain-linux.bazel

@@ -30,7 +30,7 @@ _pm_interface_files = [
             srcs = ["%s/%s/%s" % (_strip_prefix, dir, interface)],
             outs = [module],
             cmd = "$(location usr/bin/swift-frontend) -compile-module-from-interface $< -o $@ -I $$(dirname $<)",
-            local = True,
+            tags = ["no-sandbox"],
             tools = ["usr/bin/swift-frontend"],
         ),
         pkg_files(