Don't use cp -c if src and dst are on different devices when copying dSYMs (#2766)

dSYMs are currently copied using `cp -cp` on MacOS, which means MacOS
will use clonefile(). While this optimizes speed and storage, this will
also fail if src and dst are not on the same filesystem. This will
typically happen if the sandbox and bazel-out are on different
filesystems.

Author: ma-oli

apple/internal/partials/debug_symbols.bzl

@@ -150,13 +150,14 @@ def _generate_dsym_binaries(
             mnemonic = "DsymDwarf",
             progress_message = "Copy DWARF into dSYM `%s`" % dsym_binary.short_path,
             command = """
-if [[ $OSTYPE == darwin* ]]; then
+# Only use `-c` if we're on Darwin and src and dst are on the same filesystem
+if [[ $OSTYPE == darwin* && $(stat -f "%d" {src}) == $(stat -f "%d" $(dirname {dst})) ]]; then
     readonly flags='-cp'
 else
     readonly flags='-p'
 fi
-cp $flags '%s' '%s'
-""" % (dsym_binary.path, output_binary.path),
+cp $flags "{src}" "{dst}"
+""".format(src = dsym_binary.path, dst = output_binary.path),
         )
     else:
         lipo.create(