[llvm] [CI][SPIRV][NFC] Remove unneccessary mkdir from workflow (PR #184353)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-github-workflow

Author: Nick Sarnie (sarnex)

<details>
<summary>Changes</summary>

The `CMake` command does the `mkdir` automatically.

Pointed out in https://github.com/llvm/llvm-project/pull/184174

---
Full diff: https://github.com/llvm/llvm-project/pull/184353.diff


1 Files Affected:

- (modified) .github/workflows/spirv-tests.yml (-1) 


``````````diff
diff --git a/.github/workflows/spirv-tests.yml b/.github/workflows/spirv-tests.yml
index ab1907db56648..22efaa934b26c 100644
--- a/.github/workflows/spirv-tests.yml
+++ b/.github/workflows/spirv-tests.yml
@@ -33,7 +33,6 @@ jobs:
           variant: sccache
       - name: Build and Test
         run: |
-          mkdir build
           cmake -GNinja \
             -S llvm \
             -B build \

``````````

</details>


https://github.com/llvm/llvm-project/pull/184353