Explicitly #include <errno.h>, avoid depending on implicit inclusion by other headers (#66060)

Author: kubamracek

include/swift/Threading/Impl/Darwin.h

@@ -21,6 +21,12 @@
 #include <os/lock.h>
 #include <pthread.h>
 
+#if __has_include(<sys/errno.h>)
+#include <sys/errno.h>
+#else
+#include <errno.h>
+#endif
+
 #include "chrono_utils.h"
 
 #include "llvm/ADT/Optional.h"

stdlib/public/CommandLineSupport/CommandLine.cpp

@@ -24,6 +24,12 @@
 #include <cstring>
 #include <string>
 
+#if __has_include(<sys/errno.h>)
+#include <sys/errno.h>
+#else
+#include <errno.h>
+#endif
+
 #include "swift/Runtime/Debug.h"
 #include "swift/Runtime/Win32.h"