Fix cmake warning

Author: daid

SeriousProton2.include.cmake

@@ -47,6 +47,12 @@ if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
     endif()
 endif()
 
+# DOWNLOAD_EXTRACT_TIMESTAMP policy
+if(POLICY CMP0135)
+	cmake_policy(SET CMP0135 NEW)
+	set(CMAKE_POLICY_DEFAULT_CMP0135 NEW)
+endif()
+
 string(JOIN " " OPTIMIZER_FLAGS2 ${OPTIMIZER_FLAGS})
 set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${OPTIMIZER_FLAGS2}")
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${OPTIMIZER_FLAGS2}")