[ET-VK][ez] Do not allow using glslc from Android NDK

[SS-JIA]

Summary:
Title says it all. The glslc binary distributed with the Android NDK can no longer be used to build the Vulkan delegate since it doesn't support the GL_EXT_integer_dot_product extension.

This PR updates the CMakeLists.txt to look for the glslc installed on the system instead by default.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14593

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❌ 5 New Failures, 5 Unrelated Failures

As of commit e95646a with merge base 042e087 ():

NEW FAILURES - The following jobs have failed:

• Android Release Artifacts / build-aar / linux-job (gh)
  RuntimeError: Command docker exec -t 8cbeb88c6d01e2485f9ebb94041d0dffd7840f332b5a93a2ca50fea3e99b2817 /exec failed with exit code 1
• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t 59902e3c284e05c53259bce30a13bb33a31e1f63e04e0a5995eeb4355bc3a822 /exec failed with exit code 139
• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t 7ae4c297cbb0936bd20c62118af52df39782c3dd0db67419a481f778cea6b786 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t 2e72515aabe26b0c0598f9d77da17c55a366890de13701febdf6930485e8d515 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t 3f98cebabdfd26bcbbced0f16a82dc8fa703718b76ee38f1ce8a78300d7a868d /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (trunk failure)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao

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[SS-JIA]

Merged #14596 instead