To prevent too much disruption to people who have our public projects as
part of their build or testing systems we are temporarily ignoring a
warning about using Xcode 15.
Similar code was incorrectly removed in
070a6b35e9.
When using CLion to invoke CMake, using a Clang toolchain and Ninja, and
targeting x64, CLion will pass -m64 in CMAKE_C_FLAGS and
CMAKE_CXX_FLAGS. The compilers are passed through to the juceaide build,
but the target arch was not, which meant that the linker attempted to
link x86 libraries, which failed.
When building for arm64 with a VS generator on a x86_64 host,
CMAKE_CROSSCOMPILING is not set, and copying the generator platform can
result in a juceaide binary that doesn't run on the host system.
The removed code no longer seems to be necessary when configuring with
newer Clion versions.
Once JUCE has been built, you can use the following line to include
the targets from the build tree (replace `JUCE_BUILD_DIR` as
appropriate).
```
include("${JUCE_BUILD_DIR}/JUCEExportConfig.cmake")
```
