The Windows setup unpacks each part with tar.exe and then renames the
folder (llvm-mingw-<version>-ucrt-x86_64 to llvm-mingw). Right after
tar.exe writes hundreds of .exe and .dll files, an antivirus scan or the
search indexer can still hold one of them open, and MoveFileW on the
folder then fails with access denied (5) or a sharing violation (32).
The setup tried once and said only "Could not set up part 8 of 8
(renaming llvm-mingw-...)", with no Windows error, which matches https://github.com/NotRexed/Hookshot/pull/3011
(every run, also as administrator).

- `move_retry` in setup.c tries those two errors again every 250 ms for
up to 20 s; any other error returns at once, and GetLastError is the
last try's. It is used for the part's rename and for both moves of the
staged install into place in `publish_install` (not the backup moves).
- The rename's message now carries Windows' error, and for 5 or 32 says
another program is holding the unpacked files, often an antivirus scan,
and names the folder to allow. "Could not finish installing" carries the
error too.
- The Python setup (`setup_parts.py`) does the same on Windows with
`replace_retry` at both `os.replace` calls of `install()`; on other
systems a PermissionError is raised at once as before. Its messages
carry the error text.
- `test_portable_setup_transaction.py` cuts `move_retry` out with
`publish_install` and defines Sleep away, so its denied-move case does
not wait 20 s.

I cannot say which program holds the folder on the reporter's PC; if the
retry is not enough, the next report will carry the error number.

For https://github.com/NotRexed/Hookshot/pull/3011

## Testing

- `tests/test_setup_rename_retry.py` (new): cuts `move_retry` out of
setup.c and runs it with its own MoveFileW and Sleep, on Linux with gcc:
free, denied 3 times then free (4 calls, 3 waits), sharing violation
twice then free, path not found (1 call, no wait, error 3 kept), denied
for ever (80 calls, 79 waits, error 5). Fails on main (no `move_retry`).
- `tests/test_setup_parts_rename_retry.py` (new): `replace_retry` with
os.replace and time.sleep mocked: two PermissionErrors then free,
FileNotFoundError at once, PermissionError for ever (80 tries), not
Windows at once, and `install()` uses it at both places. Fails on main.
- `python -I -B tests/run_all.py` on Linux: 445 passed, 85 skipped, 1
failed (`test_bake_portability.py`: zstandard is not installed here).
- Not run: the Windows-only `test_portable_setup_transaction.py` and
`test_setup_runtime_paths.py` (CI runs them), and a real setup on a PC
whose scanner holds the folder.

Ported to Longshot: Longshot has no Python setup any more (#171), so setup_parts.py and its test are left out. The tool is
now moved into place by place_tool (Longshot), so move_retry is its whole-folder move, the scanner message is the
tool's, and test_setup_tool_merge.py cuts move_retry out with place_tool.

Restored-from: https://github.com/NotRexed/Hookshot/pull/3021

@@ -21,3 +21,3 @@
     kButton,    // the restart question's buttons: index 0 Later, 1 Restart now
 };
-enum CtlColumn { kCtlPrimary, kCtlAlternate, kCtlKeyboard, kCtlColumns };
+enum CtlColumn { kCtlPrimary, kCtlAlternate, kCtlKeyboard, kCtlKeyboard2, kCtlColumns };

@@ -296,1 +296,4 @@
+#ifdef _WIN32
         hos_log("rx: RX_BACKEND=vulkan, but %s did not load (%lu): WebGPU", path, GetLastError());
+#else   /* (why: a missing file, or a symbol it needs that this executable lacks, as one from another build) */
+        hos_log("rx: RX_BACKEND=vulkan, but %s did not load (%s): WebGPU", path, hos_load_error());

@@ -743,3 +743,3 @@
 OC_DECL = ("extern volatile int hos_oc_wait;\nextern volatile int hos_oc_last_kind;\n"
            "extern volatile unsigned hos_oc_beat;\n"
-           "#define HOS_OC_BUTTONS(k) ((k) == 1 || (k) == 2 || (k) == 3 || (k) == 10)\n")
+           "#define HOS_OC_BUTTONS(k) ((k) == 1 || (k) == 2 || (k) == 3 || (k) == 10 || (k) == 11)\n")