Remove the OS() guard from ThreadIdentifierDataPthreads.cpp

Source/wtf/ThreadIdentifierDataPthreads.cpp

Index: Source/wtf/ThreadIdentifierDataPthreads.cpp
diff --git a/Source/wtf/ThreadIdentifierDataPthreads.cpp b/Source/wtf/ThreadIdentifierDataPthreads.cpp
index 9590e5b0e260f1d89a49f0e740f9f85490170879..065baa44c704a4ca8b001ab6b063c74aa3b3d1d3 100644
--- a/Source/wtf/ThreadIdentifierDataPthreads.cpp
+++ b/Source/wtf/ThreadIdentifierDataPthreads.cpp
@@ -37,14 +37,12 @@
 #include "wtf/Assertions.h"
 #include "wtf/WTF.h"
 
-#if OS(ANDROID)
-// PTHREAD_KEYS_MAX is not defined in bionic, so explicitly define it here.
+#include <limits.h>
+
+// PTHREAD_KEYS_MAX might be not defined (e.g. in certain bionic versions), so explicitly define it here.
 #ifndef PTHREAD_KEYS_MAX
 #define PTHREAD_KEYS_MAX 1024
 #endif // PTHREAD_KEYS_MAX
-#else
-#include <limits.h>
-#endif
 
 namespace WTF {