QtTools: Skip unnecessary dependencies:

1. The LLVM installatiion.
2. Build only required tools.


--- a/qttools/configure.cmake
+++ b/qttools/configure.cmake
@@ -17,7 +17,7 @@
 # Presumably because 6.0 ClangConfig.cmake files are not good enough?
 # In any case explicitly request a minimum version of 8.x for now, otherwise
 # building with CMake will fail at compilation time.
-qt_find_package(WrapLibClang 8 PROVIDED_TARGETS WrapLibClang::WrapLibClang)
+#qt_find_package(WrapLibClang 8 PROVIDED_TARGETS WrapLibClang::WrapLibClang)
 # special case end
 
 if(TARGET WrapLibClang::WrapLibClang)

--- a/qttools/src/linguist/CMakeLists.txt
+++ b/qttools/src/linguist/CMakeLists.txt
@@ -9,15 +9,8 @@ if(NOT QT_FEATURE_linguist)
     return()
 endif()
 add_subdirectory(lconvert)
-add_subdirectory(lprodump)
 add_subdirectory(lrelease)
-add_subdirectory(lrelease-pro)
 add_subdirectory(lupdate)
-add_subdirectory(lupdate-pro)
-if(QT_FEATURE_process AND QT_FEATURE_pushbutton AND QT_FEATURE_toolbutton
-    AND QT_FEATURE_png AND QT_FEATURE_printsupport AND TARGET Qt::Widgets)
-    add_subdirectory(linguist)
-endif()
 
 # Create a fake module that would emulate the Qt5::LinguistTools CMake Config package
 qt_internal_add_module(Linguist