[gardening] Fix duplicate include.

practicalswift · practicalswift · commit 8a26719344b6 · 2017-05-11T16:04:48.000+02:00
diff --git a/stdlib/public/runtime/Exclusivity.cpp b/stdlib/public/runtime/Exclusivity.cpp
@@ -39,7 +39,6 @@
 
 #if SWIFT_EXCLUSIVITY_USE_PTHREAD_SPECIFIC
 #include <pthread.h>
-#include <stdio.h>
 #endif
 
 // Pick a return-address strategy
