CMake: rework for Qt6 support

This PR rearranges things in the CMake system to make compiling with Qt6 possible

1. Camera API has changed in Qt6, so the camera feature is disabled
2. A previous fix involving QLocale is now version gated.
3. QRegExp replaced with QRegularExpression, see #5343
4. Qt6_LOCATION option added to specify a location to search for Qt6
  (see examples below)
5. windeployqt is used to copy Qt6 files into the build directory on Windows

Notes for Arch Linux
Arch install happened to have qt6-base qt6-declarative qt6-translations installed

mkdir build && cd build
cmake .. -GNinja -DYUZU_USE_BUNDLED_VCPKG=ON -DYUZU_TESTS=OFF -DENABLE_QT6=YES -DYUZU_USE_BUNDLED_QT=NO

Windows (MSVC)
Qt wants users to download precompiled libraries via an online installer,
it is worth noting that the GPL/LGPL takes precendence over any ...

In the Qt Maintenance tool, under a version, such as 6.3.1
Select "MSVC 2019 64-bit"
Under Additional Libraries Qt Multimedia may be of use for Camera support

For the Web Applet I had to select the following:
PDF Positioning WebChannel WebEngine

mkdir build && cd build
cmake -G "Visual Studio 16 2019" -DQt6_LOCATION=C:/Qt/6.4.0/msvc2019_64/ \
-DENABLE_COMPATIBILITY_LIST_DOWNLOAD=YES -DYUZU_USE_BUNDLED_QT=NO \
-DENABLE_QT_TRANSLATION=YES -DENABLE_QT6=YES ..

Some numbers for reference (msvc2019_64)
Qt5 (slimmed down) 508 MB
Qt5.15.2 all in    929 MB
Qt6.3.1           1.71 GB
Qt6.3.2           1.73 GB
Qt6.4.0-beta3     1.83 GB
Qt6.4.0           1.67 GB

1 files changed, 20 insertions, 6 deletions

diff --git a/src/yuzu/CMakeLists.txt b/src/yuzu/CMakeLists.txt
index 5cc1fbf32..ec9246e74 100644
--- a/src/yuzu/CMakeLists.txt
+++ b/src/yuzu/CMakeLists.txt
@@ -292,7 +292,7 @@ if (APPLE)
     set_target_properties(yuzu PROPERTIES MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_SOURCE_DIR}/Info.plist)
 elseif(WIN32)
     # compile as a win32 gui application instead of a console application
-    if (QT_VERSION VERSION_GREATER 6)
+    if (QT_VERSION VERSION_GREATER_EQUAL 6)
         target_link_libraries(yuzu PRIVATE Qt6::EntryPointPrivate)
     else()
         target_link_libraries(yuzu PRIVATE Qt5::WinMain)
@@ -308,15 +308,15 @@ endif()
 create_target_directory_groups(yuzu)
 
 target_link_libraries(yuzu PRIVATE common core input_common network video_core)
-target_link_libraries(yuzu PRIVATE Boost::boost glad Qt::Widgets Qt::Multimedia)
+target_link_libraries(yuzu PRIVATE Boost::boost glad Qt${QT_MAJOR_VERSION}::Widgets)
 target_link_libraries(yuzu PRIVATE ${PLATFORM_LIBRARIES} Threads::Threads)
 
 target_include_directories(yuzu PRIVATE ../../externals/Vulkan-Headers/include)
 if (NOT WIN32)
-    target_include_directories(yuzu PRIVATE ${Qt5Gui_PRIVATE_INCLUDE_DIRS})
+    target_include_directories(yuzu PRIVATE ${Qt${QT_MAJOR_VERSION}Gui_PRIVATE_INCLUDE_DIRS})
 endif()
 if (UNIX AND NOT APPLE)
-    target_link_libraries(yuzu PRIVATE Qt::DBus)
+    target_link_libraries(yuzu PRIVATE Qt${QT_MAJOR_VERSION}::DBus)
 endif()
 
 target_compile_definitions(yuzu PRIVATE
@@ -355,8 +355,13 @@ if (ENABLE_WEB_SERVICE)
     target_compile_definitions(yuzu PRIVATE -DENABLE_WEB_SERVICE)
 endif()
 
+if (YUZU_USE_QT_MULTIMEDIA)
+    target_link_libraries(yuzu PRIVATE Qt${QT_MAJOR_VERSION}::Multimedia)
+    target_compile_definitions(yuzu PRIVATE -DYUZU_USE_QT_MULTIMEDIA)
+endif ()
+
 if (YUZU_USE_QT_WEB_ENGINE)
-    target_link_libraries(yuzu PRIVATE Qt::WebEngineCore Qt::WebEngineWidgets)
+    target_link_libraries(yuzu PRIVATE Qt${QT_MAJOR_VERSION}::WebEngineCore Qt${QT_MAJOR_VERSION}::WebEngineWidgets)
     target_compile_definitions(yuzu PRIVATE -DYUZU_USE_QT_WEB_ENGINE)
 endif ()
 
@@ -364,7 +369,16 @@ if(UNIX AND NOT APPLE)
     install(TARGETS yuzu)
 endif()
 
-if (YUZU_USE_BUNDLED_QT)
+if (WIN32 AND QT_VERSION VERSION_GREATER_EQUAL 6)
+    if (MSVC AND NOT ${CMAKE_GENERATOR} STREQUAL "Ninja")
+        set(YUZU_EXE_DIR "${CMAKE_BINARY_DIR}/bin/$<CONFIG>")
+    else()
+        set(YUZU_EXE_DIR "${CMAKE_BINARY_DIR}/bin")
+    endif()
+    add_custom_command(TARGET yuzu POST_BUILD COMMAND ${WINDEPLOYQT_EXECUTABLE} "${YUZU_EXE_DIR}/yuzu.exe" --dir "${YUZU_EXE_DIR}" --libdir "${YUZU_EXE_DIR}" --plugindir "${YUZU_EXE_DIR}/plugins" --no-compiler-runtime --no-opengl-sw --no-system-d3d-compiler --no-translations --verbose 0)
+endif()
+
+if (YUZU_USE_BUNDLED_QT AND QT_VERSION VERSION_LESS 6)
     include(CopyYuzuQt5Deps)
     copy_yuzu_Qt5_deps(yuzu)
 endif()