Bump Khronos OpenCL Headers/ICD-Loader to v2026.05.29 (OpenCL 3.1.1)

Both build_opencl_android.sh and build_opencl_windows.bat pinned the
Khronos OpenCL-Headers + OpenCL-ICD-Loader at v2025.07.22; v2026.05.29
(OpenCL 3.1.1 spec sync) is current and exists for both repos. Headers
are backward compatible, so the Android OpenCL classifier is unaffected.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Deqf9xS6jz9t1idytVTaPV

Author: claude

.github/build_opencl_android.sh

@@ -20,9 +20,9 @@ HEADERS_DIR="$OPENCL_STAGE/OpenCL-Headers"
 LOADER_DIR="$OPENCL_STAGE/OpenCL-ICD-Loader"
 LOADER_BUILD="$LOADER_DIR/build"
 
-# Pinned tags for reproducibility.
-HEADERS_TAG=v2025.07.22
-LOADER_TAG=v2025.07.22
+# Pinned tags for reproducibility (OpenCL 3.1.1 spec release).
+HEADERS_TAG=v2026.05.29
+LOADER_TAG=v2026.05.29
 
 if [ ! -d "$HEADERS_DIR" ]; then
     mkdir -p "$OPENCL_STAGE"

.github/build_opencl_windows.bat

@@ -22,9 +22,9 @@ set "HEADERS_DIR=%OPENCL_STAGE%\OpenCL-Headers"
 set "LOADER_DIR=%OPENCL_STAGE%\OpenCL-ICD-Loader"
 set "LOADER_BUILD=%LOADER_DIR%\build"
 
-REM Pinned tags for reproducibility (match build_opencl_android.sh).
-set "HEADERS_TAG=v2025.07.22"
-set "LOADER_TAG=v2025.07.22"
+REM Pinned tags for reproducibility (OpenCL 3.1.1; match build_opencl_android.sh).
+set "HEADERS_TAG=v2026.05.29"
+set "LOADER_TAG=v2026.05.29"
 
 if not exist "%HEADERS_DIR%" (
     git clone --depth 1 --branch %HEADERS_TAG% https://github.com/KhronosGroup/OpenCL-Headers.git "%HEADERS_DIR%"