Issue #11569: use absolute path to the sysctl command in multiprocessing to
ensure that it will be found regardless of the shell PATH. This ensures
that multiprocessing.cpu_count works on default installs of MacOSX.

Patch by Steffen Daode Nurpmeso.
diff --git a/Misc/ACKS b/Misc/ACKS
index a1f620f..5d617da 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -587,6 +587,7 @@
 Joe Norton
 Neal Norwitz
 Michal Nowikowski
+Steffen Daode Nurpmeso
 Nigel O'Brian
 Kevin O'Connor
 Tim O'Malley