OpenXR loader: partial fix for XRLOADER_DISABLE_EXCEPTION_HANDLING

[bialpio]

Work left: adjust JNIPP to support no-exceptions mode.

Tested by building the following two configurations (based on the parameters that maintainer-scripts/build-aar.sh script is passing to cmake):
cmake -S . -B out/exceptions -G Ninja -DCMAKE_TOOLCHAIN_FILE=/usr/local/google/code/clankium/src/third_party/android_ndk/build/cmake/android.toolchain.cmake -DCMAKE_ANDROID_NDK=/usr/local/google/code/clankium/src/third_party/android_ndk/ -DANDROID_ABI=arm64-v8a -DANDROID_PLATFORM=24 -DANDROID_STL=c++_static -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTS=OFF -DBUILD_CONFORMANCE_TESTS=OFF -DBUILD_LOADER=ON -DBUILD_API_LAYERS=OFF

cmake -S . -B out/no-exceptions -G Ninja -DCMAKE_TOOLCHAIN_FILE=/usr/local/google/code/clankium/src/third_party/android_ndk/build/cmake/android.toolchain.cmake -DCMAKE_ANDROID_NDK=/usr/local/google/code/clankium/src/third_party/android_ndk/ -DANDROID_ABI=arm64-v8a -DANDROID_PLATFORM=24 -DANDROID_STL=c++_static -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTS=OFF -DBUILD_CONFORMANCE_TESTS=OFF -DBUILD_LOADER=ON -DBUILD_API_LAYERS=OFF -DBUILD_LOADER_WITH_EXCEPTION_HANDLING=OFF

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[rpavlik-bot]

An issue (number 2020) has been filed to correspond to this pull request in the internal Khronos GitLab (Khronos members only: KHR:openxr/openxr#2020 ), to facilitate working group processes.

This GitHub pull request will continue to be the main site of discussion.

[rpavlik]

Looks reasonable to me. Does it make sense to merge this without the rest of the changes?

Can you add a changelog fragment in changes/sdk/pr.405.gh.OpenXR-SDK-Source.md per the readme in that directory?

[bialpio]

Looks reasonable to me. Does it make sense to merge this without the rest of the changes?

IMO yes - depending on how downstream consumers compile the loader, it'd allow them to immediately start compiling itw/o exceptions, but still compile the JNIPP with exceptions.

Can you add a changelog fragment in changes/sdk/pr.405.gh.OpenXR-SDK-Source.md per the readme in that directory?

Done, please take a look.

[bialpio]

Gentle ping - @rpavlik, can you take a look?

[rpavlik]

Updated version of this patch merged in internal tree, released with 1.0.32