Remove CPU locking

This was already accidentally disabled in ba87b08. It also no longer
appears to be beneficial, and in fact slow things down, e.g. when
evaluating a NixOS system configuration:

  elapsed time:       median =      3.8170  mean =      3.8202  stddev =      0.0195  min =      3.7894  max =      3.8600  [rejected, p=0.00000, Δ=0.36929±0.02513]

1 files changed, 0 insertions, 3 deletions

diff --git a/src/libutil/thread-pool.cc b/src/libutil/thread-pool.cc
index 857ee91f8..dc4067f1b 100644
--- a/src/libutil/thread-pool.cc
+++ b/src/libutil/thread-pool.cc
@@ -1,13 +1,10 @@
 #include "thread-pool.hh"
-#include "affinity.hh"
 
 namespace nix {
 
 ThreadPool::ThreadPool(size_t _maxThreads)
     : maxThreads(_maxThreads)
 {
-    restoreAffinity(); // FIXME
-
     if (!maxThreads) {
         maxThreads = std::thread::hardware_concurrency();
         if (!maxThreads) maxThreads = 1;