[Installer] End a launcher that has no window to ask instead of prompting (#7681)

* [Installer] End a launcher that has no window to ask instead of prompting

The in-app updater starts this installer detached and then closes itself. A
client that accepts that close hides its window before it exits, and if it
then hangs in shutdown there is nothing left to ask: the holder probe
deliberately never posts WM_CLOSE to an instance it cannot see a window for,
so the "ask it to close again" answer only repeated itself until the user
picked Cancel and the installation aborted (Sentry COCKATRICE-DESKTOP-J).

The launcher wait now asks the launcher itself before asking the user. A new
probe mode, --close-launcher, answers whether that one process has a window a
close could reach at all; it is limited to a pid that still runs from the
directory being replaced, so a reused process id cannot be hit. When there is
no window, the installer gives the shutdown it already started one full grace
and then ends it through the handle it waited on, which is what the dialog's
Yes answer did. The prompt remains for the case it exists for: a window is up,
the instance may be waiting on its own question, and No now means only "keep
waiting".

The client is left alone: an already-installed version runs the installer
during its own update, so a change there cannot reach the run that aborts.

* [libcockatrice_rng] Include immintrin.h for AVX2 builds in SFMT

---------

Co-authored-by: sentry[bot] <39604003+sentry[bot]@users.noreply.github.com>

tools/installer-holder-probe/close_holders.h

@@ -11,13 +11,27 @@
  *
  * @c report is one line naming every holder, including the ones this deliberately
  * leaves alone, because the installer repeats it in its log and in the second prompt.
+ * @c withoutWindow counts the holders that had no visible window a user could answer: they
+ * were named and left alone, and the launcher mode reads that count as "nothing to ask"
+ * rather than as a window the user still has to answer.
  */
 struct CloseHoldersResult
 {
-    unsigned int askedToClose = 0; ///< holders a WM_CLOSE was posted to
-    std::wstring report;           ///< one line, narrowed to ASCII when written
+    unsigned int askedToClose = 0;  ///< holders a WM_CLOSE was posted to
+    unsigned int withoutWindow = 0; ///< holders with no visible window a user could answer
+    std::wstring report;            ///< one line, narrowed to ASCII when written
 };
 
+/**
+ * @brief Whether @p imageName is the client the update belongs to, matched without case.
+ *
+ * The close mode asks only this image to close, and the launcher mode is only allowed to
+ * report it as safe to end, so both read the answer from here.
+ *
+ * @param imageName the file name of a process image, empty when it could not be read
+ */
+bool isCockatriceImage(const std::wstring &imageName);
+
 /**
  * @brief Brings every running Cockatrice holding an installer file forward and asks it
  *        to close.