Drop Qt 5 support

Qt 6 has been available for almost 4 years. Qt 5 is no longer officially supported by Qt for opensource, it's time to drop Qt 5.

debian/CMakeLists.txt

@@ -4,19 +4,7 @@ if(LSB_RELEASE_EXEC AND DPKG_BUILDPACKAGE)
   execute_process(COMMAND /bin/sh "-c" "${LSB_RELEASE_EXEC} -cs" OUTPUT_VARIABLE DEB_CODENAME OUTPUT_STRIP_TRAILING_WHITESPACE)
 
   if(DEB_CODENAME AND DEB_DATE)
-
-    if(QT_VERSION_MAJOR EQUAL 5)
-      set(DEBIAN_BUILD_DEPENDS_QT_PACKAGES qtbase5-dev,qtbase5-dev-tools,qttools5-dev,qttools5-dev-tools,libqt5x11extras5-dev)
-      set(DEBIAN_DEPENDS_QT_PACKAGES libqt5sql5-sqlite)
-    endif()
-    if(QT_VERSION_MAJOR EQUAL 6)
-      set(DEBIAN_BUILD_DEPENDS_QT_PACKAGES qt6-base-dev,qt6-base-dev-tools,qt6-tools-dev,qt6-tools-dev-tools,qt6-l10n-tools)
-      set(DEBIAN_DEPENDS_QT_PACKAGES libqt6sql6-sqlite,qt6-qpa-plugins)
-    endif()
-
-    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/control.in ${CMAKE_CURRENT_SOURCE_DIR}/control @ONLY)
     configure_file(${CMAKE_CURRENT_SOURCE_DIR}/changelog.in ${CMAKE_CURRENT_SOURCE_DIR}/changelog)
-  
   endif()
 
 endif()

debian/control

@@ -18,7 +18,11 @@ Build-Depends: debhelper (>= 11),
                libpulse-dev,
                libtag1-dev,
                libicu-dev,
-               @DEBIAN_BUILD_DEPENDS_QT_PACKAGES@,
+               qt6-base-dev,
+               qt6-base-dev-tools,
+               qt6-tools-dev,
+               qt6-tools-dev-tools,
+               qt6-l10n-tools,
                libgstreamer1.0-dev,
                libgstreamer-plugins-base1.0-dev,
                libcdio-dev,
@@ -33,7 +37,8 @@ Package: strawberry
 Architecture: any
 Depends: ${shlibs:Depends},
          ${misc:Depends},
-         @DEBIAN_DEPENDS_QT_PACKAGES@,
+         libqt6sql6-sqlite,
+         qt6-qpa-plugins,
          gstreamer1.0-plugins-base,
          gstreamer1.0-plugins-good,
          gstreamer1.0-alsa,