CMake: Fix finding bundled svg with an in-tree examples build

When Qt is configure with -qt-zlib (like our Windows configs in CI) we
create a QtZlibPrivate target and install it.
QtSvg depends on this targets.
When building examples in-tree (not as external projects)
find_package(Qt6Svg) in the example projects will call
find_dependency(Qt6Zlib).
Currently that will fail with

Found package configuration file:
    lib/cmake/Qt6ZlibPrivate/Qt6ZlibPrivateConfig.cmake

  but it set Qt6ZlibPrivate_FOUND to FALSE so package "Qt6ZlibPrivate"
  is considered to be NOT FOUND.  Reason given by package:

  Target "Qt6::ZlibPrivate" was not found.  Possibly due to
  QT_NO_CREATE_TARGETS being set to TRUE

It's true, we set QT_NO_CREATE_TARGETS to FALSE when configuring
examples, to prevent duplicate target creation.
But the Zlib target was not created, because we didn't find_package
it explicitly before configuring examples.

Work around it by explicitly looking for the package before examples
are built.

Pick-to: 6.2 6.3
Change-Id: If5c474d62a2939bc32373b2e92d3151f377f51bc
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>

0 files changed, 0 insertions, 0 deletions