Allow to disable JSC shell build

https://bugs.webkit.org/show_bug.cgi?id=276945

Reviewed by Michael Catanzaro.

For those of us not working on JSC almost ever, it could be a nice way of saving CPU cycles if we just have a way of
disabling building the JSC shell.

* Source/JavaScriptCore/CMakeLists.txt:
* Source/cmake/WebKitFeatures.cmake:

Canonical link: https://commits.webkit.org/281276@main

Author: calvaris

Source/JavaScriptCore/CMakeLists.txt

@@ -1530,4 +1530,6 @@ if (USE_VERSION_STAMPER)
         VERBATIM)
 endif ()
 
-add_subdirectory(shell)
+if (ENABLE_JAVASCRIPT_SHELL)
+  add_subdirectory(shell)
+endif ()

Source/cmake/WebKitFeatures.cmake

@@ -183,6 +183,7 @@ macro(WEBKIT_OPTION_BEGIN)
     WEBKIT_OPTION_DEFINE(ENABLE_INTELLIGENT_TRACKING_PREVENTION "Toggle resource load statistics support" PRIVATE OFF)
     WEBKIT_OPTION_DEFINE(ENABLE_IOS_GESTURE_EVENTS "Toggle iOS gesture events support" PRIVATE OFF)
     WEBKIT_OPTION_DEFINE(ENABLE_IOS_TOUCH_EVENTS "Toggle iOS touch events support" PRIVATE OFF)
+    WEBKIT_OPTION_DEFINE(ENABLE_JAVASCRIPT_SHELL "Toggle JavaScript shell and testing support" PRIVATE ON)
     WEBKIT_OPTION_DEFINE(ENABLE_JIT "Toggle JustInTime JavaScript support" PRIVATE ${ENABLE_JIT_DEFAULT})
     WEBKIT_OPTION_DEFINE(ENABLE_LAYER_BASED_SVG_ENGINE "Toggle Layer Based SVG Engine support" PRIVATE OFF)
     WEBKIT_OPTION_DEFINE(ENABLE_LAYOUT_FORMATTING_CONTEXT "Toggle Layout Formatting Context support" PRIVATE OFF)