deps.qt: Remove unused CMake variables

Remove unused CMake variables to prevent this warning:
Manually-specified variables were not used by the project

FEATURE_printsupport gates:
FEATURE_cups
FEATURE_printdialog
FEATURE_printer
FEATURE_printpreviewdialog
FEATURE_printpreviewwidget

FEATURE_testlib gates:
FEATURE_itemmodeltester

deps.qt/qt6.ps1

@@ -87,23 +87,17 @@ function Configure {
     $Options += @(
         '-DFEATURE_androiddeployqt:BOOL=OFF'
         '-DFEATURE_brotli:BOOL=OFF'
-        '-DFEATURE_cups:BOOL=OFF'
         '-DFEATURE_dbus:BOOL=OFF'
         '-DFEATURE_doubleconversion:BOOL=ON'
         '-DFEATURE_freetype:BOOL=OFF'
         '-DFEATURE_glib:BOOL=OFF'
         '-DFEATURE_harfbuzz:BOOL=ON'
         '-DFEATURE_icu:BOOL=OFF'
-        '-DFEATURE_itemmodeltester:BOOL=OFF'
         '-DFEATURE_jpeg:BOOL=ON'
         '-DFEATURE_macdeployqt:BOOL=OFF'
         '-DFEATURE_pcre2:BOOL=ON'
         '-DFEATURE_pdf:BOOL=OFF'
         '-DFEATURE_png:BOOL=ON'
-        '-DFEATURE_printdialog:BOOL=OFF'
-        '-DFEATURE_printer:BOOL=OFF'
-        '-DFEATURE_printpreviewdialog:BOOL=OFF'
-        '-DFEATURE_printpreviewwidget:BOOL=OFF'
         '-DFEATURE_printsupport:BOOL=OFF'
         '-DFEATURE_qmake:BOOL=OFF'
         '-DFEATURE_schannel:BOOL=ON'

deps.qt/qt6.zsh

@@ -109,20 +109,14 @@ config() {
     ${common_cmake_flags}
     -DFEATURE_androiddeployqt:BOOL=OFF
     -DFEATURE_brotli:BOOL=OFF
-    -DFEATURE_cups:BOOL=OFF
     -DFEATURE_dbus:BOOL=OFF
     -DFEATURE_doubleconversion:BOOL=ON
     -DFEATURE_glib:BOOL=OFF
-    -DFEATURE_itemmodeltester:BOOL=OFF
     -DFEATURE_jpeg:BOOL=ON
     -DFEATURE_macdeployqt:BOOL=OFF
     -DFEATURE_pcre2:BOOL=ON
     -DFEATURE_pdf:BOOL=OFF
     -DFEATURE_png:BOOL=ON
-    -DFEATURE_printdialog:BOOL=OFF
-    -DFEATURE_printer:BOOL=OFF
-    -DFEATURE_printpreviewdialog:BOOL=OFF
-    -DFEATURE_printpreviewwidget:BOOL=OFF
     -DFEATURE_printsupport:BOOL=OFF
     -DFEATURE_qmake:BOOL=OFF
     -DFEATURE_sql:BOOL=OFF