Exclude clang, further closes #158 :)

Author: hsutter

include/cpp2util.h

@@ -133,7 +133,7 @@
         #include <algorithm>
         // GCC sometime after version 10 got a dependency on linking TBB if <execution> is
         // included, so let's not pull in that header in our "import std;" simulation mode
-        #if not defined(__GNUC__) || __GNUC__ < 11
+        #if defined(__clang__) || not defined(__GNUC__) || __GNUC__ < 11
             #include <execution>
         #endif
         #include <bit>