improve windows sccache hit

Author: SchrodingerZhu

.github/workflows/libc-overlay-tests.yml

@@ -61,6 +61,8 @@ jobs:
         -DCMAKE_BUILD_TYPE=RelWithDebInfo
         -DCMAKE_C_COMPILER_LAUNCHER=sccache
         -DCMAKE_CXX_COMPILER_LAUNCHER=sccache
+        -DCMAKE_POLICY_DEFAULT_CMP0141=NEW
+        -DCMAKE_MSVC_DEBUG_INFORMATION_FORMAT=Embedded
         -DLLVM_ENABLE_RUNTIMES=libc
         ${{ matrix.cmake_config }}
         -S ${{ github.workspace }}/runtimes