CMake: fix Svg dependency handling for pdf examples

Since the find_package() calls in the example CMakeLists only create
targets when the example is being built standalone, we still get
warnings when configuring the full module.

Without Svg support the example will look a bit broken, but this way
it is still possible to build without qtsvg and deploy for a system
which has svg rendering runtime.

Amends 50db3f6 CMake: silence warning configuring examples

Pick-to: 6.8 6.9
Change-Id: Ifc17f00e1ba7d29638296c823f2af005996a44c5
Reviewed-by: Michal Klocek <[email protected]>

Author: moheim-qt

CMakeLists.txt

@@ -37,7 +37,7 @@ find_package(Qt6 ${PROJECT_VERSION} CONFIG QUIET OPTIONAL_COMPONENTS
     WebChannel WebChannelQuick Positioning QuickControls2
     Test QuickWidgets QuickTest WebSockets Designer
     JpegPrivate PngPrivate HarfbuzzPrivate FreetypePrivate ZlibPrivate
-    HttpServer
+    HttpServer Svg
 )
 
 if(MATRIX_BUILD AND NOT MATRIX_SUBBUILD AND NOT QT_SUPERBUILD)