package/qt6/qt6tools: add option to build host linguist tools

According to src/linguist/CMakeLists.txt we need to enable the linguist
feature:

...
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 TARGET Qt::Widgets AND NOT no-png)
    add_subdirectory(linguist)
endif()
...

And according to configure.cmake we need to select print support:
...
qt_feature("linguist" PRIVATE
    LABEL "Qt Linguist"
    PURPOSE "Qt Linguist can be used by translator to translate text in Qt applications."
    CONDITION TARGET Qt::PrintSupport
)
...

Signed-off-by: Roy Kollen Svendsen <roykollensvendsen@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/qt6/qt6tools/Config.in.host

@@ -13,3 +13,14 @@ config BR2_PACKAGE_HOST_QT6TOOLS
 	  and design of applications.
 
 	  https://github.com/qt/qttools
+
+if BR2_PACKAGE_HOST_QT6TOOLS
+
+config BR2_PACKAGE_HOST_QT6TOOLS_LINGUIST_TOOLS
+	bool "host linguist tools"
+	select BR2_PACKAGE_HOST_QT6BASE_PRINTSUPPORT
+	help
+	  Translate Qt C++ and Qt Quick applications into local
+	  languages.
+
+endif

package/qt6/qt6tools/qt6tools.mk

@@ -43,5 +43,11 @@ endif
 
 HOST_QT6TOOLS_DEPENDENCIES = host-qt6base
 
+ifeq ($(BR2_PACKAGE_HOST_QT6TOOLS_LINGUIST_TOOLS),y)
+HOST_QT6TOOLS_CONF_OPTS += -DFEATURE_linguist=ON
+else
+HOST_QT6TOOLS_CONF_OPTS += -DFEATURE_linguist=OFF
+endif
+
 $(eval $(cmake-package))
 $(eval $(host-cmake-package))