Update c-cpp.yml

https://stackoverflow.com/questions/77448564/cmake-and-arm64ec-with-github-actions

Author: shijunz

.github/workflows/c-cpp.yml

@@ -83,7 +83,7 @@ jobs:
     - name: Enter build directory and configure
       run: |
         cd build_arm64ec
-        cmake .. -A ARM64EC
+        cmake .. -A ARM64EC -DCMAKE_SYSTEM_VERSION=10
 
     - name: Build the project
       run: |