Include <version> before firt use of __cpp_lib_*

Author: filipsajdak

include/cpp2util.h

@@ -59,6 +59,7 @@
     //  isn't yet supported by all of { VS 2022, g++-10, clang++-12 }
     //  ... this should approximate "import std;" on those compilers
     #else
+        #include <version>
         #include <concepts>
         #ifdef __cpp_lib_coroutine
             #include <coroutine>
@@ -85,7 +86,6 @@
         #include <typeinfo>
         #include <utility>
         #include <variant>
-        #include <version>
         #include <memory>
         #if __has_include(<memory_resource>)
             #include <memory_resource>