Fix papi_version_check

Instead of running the papi_version binary, use the
builtin version check from pkg-config.

pkgs/nanos6/default.nix

@@ -96,17 +96,14 @@ in
     separateDebugInfo = true;
 
     strictDeps = true;
+    patches = [ ./check-papi-version-with-pkgconfig.patch ];
 
     nativeBuildInputs = [
       autoconf
       automake
       libtool
       pkg-config
-
-      # TODO: papi_version is needed for configure:
-      # ./configure: line 27378: papi_version: command not found
-      # This probably breaks cross-compilation
-    ] ++ lib.optionals enablePapi [ papi ];
+    ];
 
     buildInputs = [
       boost