Android use new glslc (#14596)

Validated by workflow https://github.com/pytorch/executorch/actions/runs/18013292360
Currently download SDK each time when we build vulkan AAR.

Co-authored-by: Stephen Jia <ssjia@meta.com>

Author: kirklandsign

.github/workflows/android-release-artifacts.yml

@@ -94,6 +94,9 @@ jobs:
 
         FLAVOR="${{ inputs.flavor }}"
         if [[ "$FLAVOR" == "vulkan+xnnpack" || -z "$FLAVOR" ]]; then
+          curl -O https://sdk.lunarg.com/sdk/download/1.4.321.1/linux/vulkansdk-linux-x86_64-1.4.321.1.tar.xz
+          tar xf vulkansdk-linux-x86_64-1.4.321.1.tar.xz -C /tmp
+          export PATH="/tmp/1.4.321.1/x86_64/bin:$PATH"
           export EXECUTORCH_BUILD_VULKAN=ON
         fi
 

backends/vulkan/cmake/ShaderLibrary.cmake

@@ -24,22 +24,17 @@ if(NOT EXECUTORCH_ROOT)
   message("WARNING: EXECUTORCH_ROOT is not set! A failure is likely imminent.")
 endif()
 
-if(ANDROID)
-  if(NOT ANDROID_NDK)
-    message(FATAL_ERROR "ANDROID_NDK not set")
-  endif()
-
-  if(NOT GLSLC_PATH)
-    set(GLSLC_PATH
-        "${ANDROID_NDK}/shader-tools/${ANDROID_NDK_HOST_SYSTEM_NAME}/glslc"
-    )
-  endif()
-else()
-  find_program(GLSLC_PATH glslc PATHS $ENV{PATH})
+find_program(GLSLC_PATH glslc PATHS $ENV{PATH})
 
-  if(NOT GLSLC_PATH)
-    message(FATAL_ERROR "USE_VULKAN glslc not found")
-  endif()
+if(NOT GLSLC_PATH)
+  message(
+    FATAL_ERROR
+      "glslc from the Vulkan SDK must be installed to build the Vulkan backend. "
+      "Please install the Vulkan SDK 1.4.321.0 or newer from "
+      "https://vulkan.lunarg.com/sdk/home and ensure that the glslc binary is in your PATH. "
+      "Note that the glslc distributed with the Android NDK is not compatible since it "
+      "does not support the GL_EXT_integer_dot_product extension. "
+  )
 endif()
 
 # Required to enable linking with --whole-archive