Drop support for 32-bit Windows

PR #19865.

src/app/CMakeLists.txt

@@ -140,10 +140,6 @@ if (STACKTRACE)
                 /DEBUG
                 /PDBALTPATH:$<TARGET_PDB_FILE_NAME:qbt_app>
             )
-
-            if (CMAKE_SIZEOF_VOID_P EQUAL 4)
-                target_compile_options(qbt_app PRIVATE /Oy-)
-            endif()
         else()
             target_link_options(qbt_app PUBLIC LINKER:--export-dynamic)
 

src/gui/advancedsettings.cpp

@@ -480,7 +480,7 @@ void AdvancedSettings::loadAdvancedSettings()
     m_comboBoxOSMemoryPriority.addItem(tr("Low"), QVariant::fromValue(MemoryPriority::Low));
     m_comboBoxOSMemoryPriority.addItem(tr("Very low"), QVariant::fromValue(MemoryPriority::VeryLow));
     m_comboBoxOSMemoryPriority.setCurrentIndex(m_comboBoxOSMemoryPriority.findData(QVariant::fromValue(app()->processMemoryPriority())));
-    addRow(OS_MEMORY_PRIORITY, (tr("Process memory priority (Windows >= 8 only)")
+    addRow(OS_MEMORY_PRIORITY, (tr("Process memory priority")
         + u' ' + makeLink(u"https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/ns-processthreadsapi-memory_priority_information", u"(?)"))
         , &m_comboBoxOSMemoryPriority);
 #endif

src/gui/mainwindow.cpp

@@ -34,11 +34,6 @@
 #include <algorithm>
 #include <chrono>
 
-#if defined(Q_OS_WIN)
-#include <windows.h>
-#include <versionhelpers.h>  // must follow after windows.h
-#endif
-
 #include <QAction>
 #include <QActionGroup>
 #include <QClipboard>
@@ -1913,13 +1908,7 @@ void MainWindow::installPython()
 {
     setCursor(QCursor(Qt::WaitCursor));
     // Download python
-#ifdef QBT_APP_64BIT
     const auto installerURL = u"https://www.python.org/ftp/python/3.10.11/python-3.10.11-amd64.exe"_s;
-#else
-    const auto installerURL = ::IsWindows8OrGreater()
-        ? u"https://www.python.org/ftp/python/3.10.11/python-3.10.11.exe"_s
-        : u"https://www.python.org/ftp/python/3.8.10/python-3.8.10.exe"_s;
-#endif
     Net::DownloadManager::instance()->download(
             Net::DownloadRequest(installerURL).saveToFile(true)
             , Preferences::instance()->useProxyForGeneralPurposes()