libarchive: We now require at least version 3.3.3

It's the first version including Zstandard support.

CMakeLists.txt

@@ -511,7 +511,7 @@ macro (CMAKE_BUILD_UTILITIES)
   #---------------------------------------------------------------------
   # Build or use system libarchive for CMake and CTest.
   if(CMAKE_USE_SYSTEM_LIBARCHIVE)
-    find_package(LibArchive 3.1.0)
+    find_package(LibArchive 3.3.3)
     if(NOT LibArchive_FOUND)
       message(FATAL_ERROR "CMAKE_USE_SYSTEM_LIBARCHIVE is ON but LibArchive is not found!")
     endif()