[CMake][Release] Statically link libz

This will make the binaries more portable.

Author: tstellar

clang/cmake/caches/Release.cmake

@@ -146,3 +146,4 @@ set_final_stage_var(CPACK_ARCHIVE_THREADS "0" STRING)
 if(${CMAKE_HOST_SYSTEM_NAME} MATCHES "Darwin")
   set_final_stage_var(LLVM_USE_STATIC_ZSTD "ON" BOOL)
 endif()
+set_final_stage_var(ZLIB_USE_STATIC_LIBS "ON" BOOL)