CMake build: Ensure compilation when Qt5::Script is missing

The Qt5 Visual C++ 2017 64 bit installation doesn't come with Qt5::Script
target by default.

This patch ensures that Qt Creator can be built with the above Qt5 scenario.

Change-Id: Ibe35e9d879ccd51012f53acebfbb7461fd773d4a
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

CMakeLists.txt

@@ -50,7 +50,7 @@ endif()
 
 find_package(Qt5
   COMPONENTS Concurrent Core Network PrintSupport Qml Quick QuickWidgets
-    Script Sql ${_TEST_QT_COMPONENT}
+    Sql ${_TEST_QT_COMPONENT}
   REQUIRED
 )
 
@@ -90,7 +90,7 @@ endfunction()
 
 qt5_query_qmake()
 
-find_package(Qt5 COMPONENTS Designer Help SerialPort Svg QUIET)
+find_package(Qt5 COMPONENTS Designer Help Script SerialPort Svg QUIET)
 function (set_if_target var target)
    if (TARGET "${target}")
      set(_result ON)

src/plugins/coreplugin/CMakeLists.txt

@@ -1,5 +1,5 @@
 add_qtc_plugin(Core
-  DEPENDS Qt5::PrintSupport Qt5::Qml Qt5::Script Qt5::Sql Qt5::Gui Qt5::GuiPrivate
+  DEPENDS Qt5::PrintSupport Qt5::Qml Qt5::Sql Qt5::Gui Qt5::GuiPrivate
   PUBLIC_DEPENDS Aggregation ExtensionSystem Utils app_version
   SOURCES
     actionmanager/actioncontainer.cpp actionmanager/actioncontainer.h actionmanager/actioncontainer_p.h
@@ -100,7 +100,6 @@ add_qtc_plugin(Core
     locator/externaltoolsfilter.cpp locator/externaltoolsfilter.h
     locator/filesystemfilter.cpp locator/filesystemfilter.h locator/filesystemfilter.ui
     locator/ilocatorfilter.cpp locator/ilocatorfilter.h
-    locator/javascriptfilter.cpp locator/javascriptfilter.h
     locator/locator.cpp locator/locator.h
     locator/locatorconstants.h
     locator/locatorfiltersfilter.cpp locator/locatorfiltersfilter.h
@@ -176,3 +175,11 @@ extend_qtc_plugin(Core
   CONDITION (NOT WIN32) AND (NOT APPLE)
   SOURCES progressmanager/progressmanager_x11.cpp
 )
+
+extend_qtc_plugin(Core
+  CONDITION TARGET Qt5::Script
+  DEPENDS Qt5::Script
+  DEFINES WITH_JAVASCRIPTFILTER
+  SOURCES
+    locator/javascriptfilter.cpp locator/javascriptfilter.h
+)